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Maximum Motorsports Full Length Subframe Connectors - Bare (79-04 All)

Market Price $183.97 You Save 13% ($24.00)
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  • Item 47001
  • MPN# MMFL-5B

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Features, Video & Details

  • XL Series Full Length Subframe Connectors
  • Bare Metal
  • 95% Stronger Then the Other Brand
  • 53% Stronger Then MM Previous Connectors
  • Extends from Rear Control Arm to the Firewall for Maximum Results

Review & Installation Video

Review & Install Video

Hey guys, Stephanie with, here with the Maximum Motorsports Full-Length Subframe Connectors for all 1979 to 2004 Mustangs. The Maximum Motorsports Full-Length Subframe Connectors are a great option for those owners out there that are looking for a high-quality option to stiffen up the chassis of the unibody Mustang as much as possible. These are full-length subframe connectors and they're designed to be the best on the market. They're longer, thicker and they have more surface area to weld. But, if you're looking to get the most out of a set of subframe connectors then these ones from Maximum Motorsports are going to be your best bet. I'm going to go ahead and say that subframe connectors are an essential modification for unibody Mustangs, no matter which brand you end up choosing. This is because unibody Mustangs don't have a full frame that runs the full length of the car. You basically have two frame sections that are connected by floor pans, so unibody Mustangs rely on subframes and floor pans to provide rigidity and strength. This leaves them very weak and subject to twist, even under the power of a completely stocked motor. A stocked motor can twist and distort the floor pan with ease, and over time this means deformed subframes, which is not a good thing. And, once you start adding power to these cars, which I might as well say is inevitable, then this becomes a bigger issue. This is where the subframe connectors are going to come into play. Subframe connectors, like the Maximum Motorsports one here, link the front subframe with the rear subframe and attach the floor pans. This adds some much needed structural integrity down the length of the car. There are different length subframe connectors and different types as well and the differences are going to come in the amount of support that the connectors can provide you. These subframe connectors are what Maximum Motorsports calls the XL series. So, not only are these full-length connectors that will offer more structural support and rigidity than standard subframe connectors, but these are even stronger with more material. They are both longer and thicker and have more welding surface area than other subframe connectors in the market. These are going to run all the way from the firewall to the rear control arms and their rectangular bare metal tubing. This much length allows for the most welding points down the length of the car, and the more the better in a case like this. So, these are weld-in subframe connectors which can be more difficult or costly to install, but honestly weld-in are the direction that you want to go in if you're serious. Weld-in connectors are stronger and provide more rigidity. Weld-in connectors are thicker and you need that material for the welds, and the performance can't be beat by any bolt-in subframe connector. Subframe connectors should be one of the first suspension mods that are considered when it comes to the '79 to '04 Mustang due to how much it'll help the chassis and performance. Making the chassis more solid and reducing flex will allow the chassis to handle power and torque better, which will only make for a more fun driving experience. I would definitely describe these connectors from Maximum Motorsports as one of the best options that you can go with. The extra length, extra material, thickness and weld-in install allow for a handful of benefits. Benefits like improved handling, launching, ride quality and comfort and floor pan damages prevented since you won't be stressing the floor pan any longer. Chassis flex negatively impacts all of these areas. You can't expect a good handling, launches or ride quality if the chassis is flexing under power. The subframe connectors will keep the frame straight, so the correct components can then function as they should instead of the frame and floor pans doing things like absorbing shock. As far as price, these subframe connectors are one of the better options that you can pick up so they're going to be on the more expensive side when we compare them to the other offerings that are out there. They aren't going to break the bank or anything; they cost $160, which is right in line with Steeda's offering, but there are some less expensive options on the site if these are a little bit more than you like to spend. So, I wouldn't say that the install is difficult, but it does require welding so you're looking at having a shop install these unless you have the equipment and can weld yourself. The install should only take a few hours, and due to the welding, I'm going to call this a '3 out of 3' wrenches on the scale. I would test fit these connectors before you just weld them right in though; and just a heads up for the '96 to '98 Cobras out there, you will need to modify the trans-cross member mounting flanges, but these will work without an issue on all other models. The connectors are side specific so just be sure you've got the correct side before you fully line up and mark where the connector will sit. You're going to want to mark all areas that the subframe touches the connector since this is where you will be welding and you will need to take those areas down to bare metal for the welds. These will be bolted into the floor pan by the two rear seat bolts and these bolts will help you hold the connector up into place for the welding. After the welding is complete, you're going to want to coat the subframe connectors and the frame rails to prevent any rusting. Wrapping things up here, the Maximum Motorsports Full-Length Subframe Connectors are an excellent upgrade for unibody Mustangs that will stiffen up the weak and flexible frame by adding structural integrity. They're a full-length connector with a boxed metal design that gives extra length, thickness and material. These offer numerous benefits for the 1979 to 2004 Mustangs and you can check them out more online right here at

Improved Design. The originator of full length subframe connectors has raised the bar for performance again. Maximum Motorsport's newest full-length subframe connectors feature 53% more rigidity then their standard subframe connectors and 95% more then most on the market for mind-blowing performance you'll have to feel to believe. Adding a set of full-length subframe connectors will make sure your car runs straight as an arrow whether it’s off the line or carving back road turns..

Strength. The XL series subframe connector is longer, thicker, and has more welding surface area than any other subframe connector on the market. Its 1.5” x 2” x .083” thick rectangular tubing extends from the mounting points of the rear control arms all the way to the firewall. With that much coverage you’ll be sure to have a strong bond and plenty of clean metal to weld them onto.

Application. Maximum Motorsports designed these subframe connectors to fit all 1979 to 2004 V6, GT, Bullitt, Mach 1, and Cobra Mustangs. Even Roush and Saleen Edition Mustangs can benefit from this upgrade as well.

Technical Note. Please test fit before welding. 1996-98 Cobras will require modifications to the transmission crossmember mounting flanges.

Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Details

What's in the Box
  • (2) subframe connectors
  • Hardware
Installation Info
Tech Specs
Will it fit my Mustang?
  • Bullitt - 01
  • Foxbody - 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93
  • Mach 1 - 03, 04
  • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04
  • Cobra - 94, 95, 96, 97, 98, 99, 01, 03, 04
  • GT - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04

People Who Bought This Item Also Bought

Most Helpful Reviews

Best you can buy

These are buy a long shot the best subframe connectors you can buy. By far the stiffest, you will notice them as soon as you open/close your doors, take a driveway, let alone get on the exit ramps and ...

Read More
Helpful (8)

Good bang for buck

Fairly easy installation, Make sure you clean them off (brake parts cleaner) and prime the undersides at least before you mount them up and weld them. These made my car much stiffer, better weight transfer, ...

Read More
Helpful (7)

Overall Rating 4.9 out of 5 stars
Read All 56 Reviews

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8 Questions / 5 Answers

Ask a Question

Will these work with side exit exhaust? My tail pipe and tip hug close to the frame. I was wondering if these will work with side exit exhausts?


  • Hi, We can not confirm fitment of side exit exhaust with these Maximum Motorsports Full Length Subframe Connectors - Bare because stock mustangs came with rear exit exhaust. A skilled custom exhaust shop might be able to fabricate something for your application.

    Chris J

Helpful (1)

Do these come with the seat brace it is not in the picture?


Buying this comes with both connectors correct?


  • Yes, this will come with 2 Maximum Motorsports Full Length Subframe Connectors.


Helpful (0)

Will these fit a 90 LX notch 4cyl conversion?


  • Yes, the Maximum Motorsports Full Length Subframe Connectors will fit a 1990 mustang LX with the 2.3l and the 5.0l engines.


Helpful (0)

Close to purchasing. Just want to make sure they fit on my 1992 GT convertible. Tks B-


  • The Maximum Motorsports Full Length Subframe Connectors will fit your 1992 GT convertible.

    Pat K

Helpful (0)

Will these fit my 95 GT with a convertible?


  • The Maximum Motorsports Full Length Subframe Connectors will fit the 1995 Mustang GT convertible without any issues.

    Rob D

Helpful (0)

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Customer Reviews (56) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Weekend

Installation Cost:$100-$250

  • Handling Improvement 4.8 4.8
  • Fit 4.75 4.8
  • Bang For Your Buck 4.825 4.8

  • 5/5

    June 08, 2011

    Best you can buy

    These are buy a long shot the best subframe connectors you can buy. By far the stiffest, you will notice them as soon as you open/close your doors, take a driveway, let alone get on the exit ramps and thrash the car around. They work excellent, anywhere these touch the metal on the car you should weld for ultimate stiffness. Powdercoat is pointless as you need to strip them wherever welded, so do yourself a favor like I did get the bare ones and then spray them with a rubber undercoating afterwards and they'll stay like new for years and years. A highly recommended buy and absolutely critical on the 79-04 fox chassis.


    Year: 2000 Submodel: Other

    Helpful (8)

  • 5/5

    March 08, 2011

    Good bang for buck

    Fairly easy installation, Make sure you clean them off (brake parts cleaner) and prime the undersides at least before you mount them up and weld them. These made my car much stiffer, better weight transfer, better braking and much better handling. I would highly recommend these subframe connectors. 2 day free shipping? Can't beat it!


    Year: 2004 Submodel: GT

    Helpful (7)

  • 5/5

    February 16, 2010

    Max Motorsports subframe connectors

    Really made a difference in my 96 Gt convertible. Drives like a different car. A great mod for the money especially to a convertible. This should be a first mod for any Mustang.


    Year: 1996 Submodel: GT

    Helpful (6)

  • 3/5

    May 10, 2010

    MM Full length subframe connectors

    Good product made of quality material but the troubleshooting in the instructions for proper fitment is poor. Needed to make alterations. After install i was impressed with the products quality and noticed a significant reduction in chassis twist and flex. Would recommend but experience with metal is a must.


    Helpful (5)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    August 12, 2013

    makes your springs work intead of your chassis

    Since i had these installed, i can actually tell that the springs are working when going over bumps. The car feels like it moves more as a single unit.


    Year: 2004 Submodel: GT middle Tennessee

    Helpful (3)

  • 5/5

    Installation Time: Afternoon

    August 15, 2012

    love mm

    Got them pretty fast, used a15% off promo. Feels wayyyyyy stiffer then stock. Welded them myself. Thanks am


    Year: 1998 Submodel: Cobra socal

    Helpful (3)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    July 21, 2012

    Best "First Mod" Ever

    What can I say, they made a huge improvement! Not only did they take the harshness out of the ride, but they made my car track straighter off the line as well. I had a shop install them locally, labor on the install was $75. And it was well worth it. And AM was awesome to order from. Free, fast shipping....what more could you ask for. Thanks American Muscle!


    Year: 2003 Submodel: GT Bowling Geen, KY

    Helpful (3)

  • 5/5

    Installation Time: Full Day

    April 29, 2012

    This should of been my first mod!

    Theese MM subframe connectors made a huge difference in my ride quality. My 95 GT is much more stable and comfortable to drive. It took me about 6 hours to do the prep and welding in my garage, and the fitment was dead on. I highly recommend this product and experiencing how big a difference it made, (for the price) this should be one of the first mods people should do. I'm very happy and highly recommend it.


    Year: 1995 Submodel: GT Orange county, CA

    Helpful (3)

  • 5/5

    September 04, 2010

    Best performance for the buck

    Awesome set of sfc's. chassis stiffen's right up and more controlled launches as result. Body flex eliminated and torque planted to the rear instead of absorbed by body twist...awesome!


    Helpful (3)

  • 5/5

    July 17, 2010

    perfec fit

    They just came in a Wednesday, Friday I went to the mufler shop and in less than 45min they were in place in my 2002 GT. There were no other customer waiting so I went ahead and clean soldered areas and all the frame, primer and paint. Feel the difference on the street.


    Year: 2002 Submodel: GT

    Helpful (3)

  • 5/5

    October 04, 2009


    Installed them at my friends house with a 220 amp welder look great really stiffened the chassis up definetly a good first mod!!!


    Helpful (3)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    March 23, 2017

    Great buy!

    $275 for the shop to weld in and paint. A must for a convertible.


    Year: 1995 Submodel: GT

    Helpful (2)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    March 17, 2017

    Definitely worth it!

    I ordered these connectors at the end of one week and got them the beginning of the next week, had a local speed shop weld then in for me and wow! It's crazy how well they stiffen up the car, a must have if you plan on making more than stock power in these unibody cars!


    Year: 1989 Submodel: LX

    Helpful (2)

  • 5/5

    Installation Time: Full Day

    August 06, 2012

    Nice and stiff.

    My older brother welded, with my dad and I helping throughout install. Installation not including trips to the store took about 7 to 8 hours. After welding, I sprayed the subframes with 3M rubberized undercoating. I have only driven the car with 15x3.5 front rims since install, so I can't comment on much of a handling improvement. But I have noticed it feels much stiffer during day to day driving. I'm looking forward to checking out the handling once the 17x9s are back on the front.


    Year: 2001 Submodel: GT SC

    Helpful (2)

  • 5/5

    Installation Time: Shop Install

    September 27, 2011

    Full Length Subframe Connectors

    These Maximum Motorsports are great! I do recommend a shop to install these, as you will need to get these welded in. If you have access to a welder, then you can do yourself. Will take some time for the install. Traction times have been great! Chassis feels stiffer!


    Year: 1990 Submodel: Other Elverson, PA

    Helpful (2)

  • 5/5

    February 05, 2011

    very nice

    these are a very nice upgrade that really help stiffen up the car. MM makes very high quality parts which is why i chose these. they were somewhat hard to line up, seemed like the seat braces needed ground out where the connector runs through them or the connector itself has a slightly wrong bend. once fitted correctly though they really helped the car alot.


    Helpful (2)

  • 5/5

    August 18, 2010

    Excellent suspension mod!

    Lets you feel the road better and eliminates chassis flex which means more power to the wheels. Im very happy with this modification. Thanks AM!

    David 2001 GT

    Helpful (2)

  • 5/5

    March 10, 2010


    I have MM LCAs and now the SFCs. Both products are great. The SFCs really stiffened the chassis up. This should be one of your first suspension mods hands down. Also the product got here in 1 day! Cant beat that!


    Helpful (2)

  • 5/5

    March 19, 2017

    Should be the first mod on list!

    believe it when people say that this should be the first mod ever on your Mustang. You and your mustang will highly appreciate this!


    Year: 2003 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    December 12, 2016

    Fox Must Have

    I bought these for my 1985 and it is practically a brand new car. No more body roll and the car handles much better. I had a shop weld them in since I do not have a welder. Anyone with a fox should really consider these!


    Year: 1985 Submodel: GT

    Helpful (1)

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