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Pypes 2.5 in. Stainless Steel Replacement Flow Tube Kit (79-04 All, Excluding 03-04 Cobra)

Market Price $68.99 You Save 26% ($18.00)
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$50.99

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  • Item 20109
  • MPN# PFF10K

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Features, Video & Details

  • Required for Aftermarket Muffler Installs
  • Mandrel-Bent Construction
  • 2.5" 409 Stainless Steel Tubing
  • Fits 1979 to 2004 Mustangs

Review & Installation Video

Review & Install Video

The Pypes 2.5-inch stainless steel replacement flow tube kit fits '79 to '04 V8 and V6 Mustangs, and '94 to '99 Cobras. You're gonna wanna check out a kit like this if you're upgrading your exhaust in stages by buying a mid-pipe and then buying a set of mufflers, in whatever order, instead of picking up a cat-back. A cat-back comes with these flow tubes, which are located between the mid-pipe and the mufflers, but if you pick up just a set of mufflers instead of a cat-back, you're looking at needing to reuse your stock flow tubes or picking up these Pypes flow tubes if you wanted to create a full aftermarket system from the mid-pipe back. The install for these isn't difficult. It's a one-out-of-three wrenches on the difficulty meter, and you can plan on spending an hour or two on the install. Sitting between the mid-pipe and the mufflers are the flow tubes. Unless you pick up a cat-back, you aren't getting a new set of these. They don't come with new aftermarket mufflers or mid-pipes, and a lot of people want to be consistent with their exhaust. That means not reusing the stock flow tubes. These flow tubes are 2.5-inch, mandrel-bent, 409 stainless steel. And I'll always say this when it comes to exhaust, but stainless steel's going to be your best bet if you want materials that are gonna hold up and not corrode. Compared to aluminized tubing, any stainless steel's gonna be stronger with a longer life. If you compare 409 to 304 grade stainless, 304's gonna be the top-of-the-line material. 409 stainless is still stainless steel, and it isn't a bad material by any means. You still get the longer life and the protection, but 409 usually costs a little bit less than 304. Speaking of cost, you can expect to pay right about $60 for these. These are currently the only flow tubes that you can pick up on the site, so there isn't really anything that we compare them to, but you know that they're 2.5-inch, and they're stainless steel, and they will fit with any setup. When it comes to the install, this is gonna be a one-out-of-three wrenches on the difficulty meter. You can plan on spending an hour or two, tops, on the install. You'll need a socket set and a way to get the car in the air. Depending on what else you're installing with these, the install might change slightly. If you're just installing the flow tubes and nothing else, the install will be straightforward. Your mufflers should have four clamps on them. You'll remove the two front clamps after unbolting the front flow tubes from the mid-pipe. Remove the flow tubes and swap in your new ones. Clamp them to the muffler, and then to the mid-pipe. I would leave things loose until you have them all lined up, and then tighten them down. And that's gonna wrap things up for the Pypes stainless steel replacement flow tube kit for '79 to '04 V8s and V6s, and '94 to '99 Cobras. You can check them out more online, right here at americanmuscle.com.

Replacement Flow Tubes. Replacing the restrictive stock mufflers is a great idea, but you may end up damaging the factory flow tubes in the process. That is why we offer Pypes 2.5" Stainless Steel Replacement Flow Tube Kit. This kit will replace the piping between the Mid Pipe and the mufflers for a perfect installation.

Durable Stainless Steel Construction. Pypes uses sturdy 16 gauge 409 stainless steel mandrel bent 2.5" tubing with a ball and socket-style connector for improved flow and includes a set of two 2.5" 304 stainless steel flanges.

Application. This Pypes 2.5" Replacement Flow Tube Kit is designed for use on the 1979 to 2004 Mustangs when replacing the stock mufflers with aftermarket mufflers or resonators.

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) Flow Tubes
  • (2) Brackets
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
  • GT - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04

People Who Bought This Item Also Bought

Most Helpful Reviews

5/5
Flow tubes

These are a great option for the guys that don't want an out-of-the-box exhaust system. Now I have one more thing on my car that I can say I "custom built". The tubes are 16.5" and 18" long, which gives ...

Read More
Helpful (4)

5/5
Flow tubes with m-80s

Installed these with a set of m-80's. With an offroad X-pipe the engine sings without choking. Bolts right up to existing midpipe and fit right in to the the Pypes m-80 mufflers with some 2.5" clamps. ...

Read More
Helpful (3)

Overall Rating 4.7 out of 5 stars
Read All 54 Reviews

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9 Questions / 5 Answers

Ask a Question

Do I have to buy these if I'm buying an x pipe and flowmaster mufflers

VincentT

  • Hey Vincent, You do not HAVE to buy them, they just clean up the piping of the exhaust system by replacing your stock pieces. but your x pipe and flowmasters should bolt on regardless

    Cobra_Machine04

Helpful (0)

I was thinking of getting these and also get the SLP Loudmouth Resonators. Would I need to weld or get clamps to connect the 2?

John

Do these bolt on directly to the bracket after the cats?

Noah

  • The Pypes 2.5 in. Stainless Steel Replacement Flow Tube Kit will connect to the mid pipe's flanges, and then to the mufflers on the opposite end.

    Rob D

Helpful (0)

Will the m- 80 pypes mufflers slip into each end of the flow tube? That way I could just clamp them or will they not fit into each other and require welding?

JasonR

  • This replacement flow tube kit will require welding.

    KevinD92

Helpful (0)

Where can I find the bolts that go along with this piece?

JulietaM

  • Hello! For this Pypes 2.5 in. Stainless Steel Replacement Flow Tube Kit you could simply just measure and buy the correct length and size hardware you will need.

    Ryan H

Helpful (0)

can you use these to replace where the catalytic covers were welded on? or can i use any kind of straight pipe for that?

jiinkx

  • These Flow Tubes are designed for when you replace stock mufflers with aftermarket mufflers or resonators. You may be able to use these to replace the catalytic converters, but it will not be a direct bolt on because of how the tubing is bent.

    AshleyK

Helpful (0)

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Customer Reviews (54) Write a Review

Overall Rating 4.7

out of 5 stars




  • 5/5

    January 07, 2011

    Flow tubes

    These are a great option for the guys that don't want an out-of-the-box exhaust system. Now I have one more thing on my car that I can say I "custom built". The tubes are 16.5" and 18" long, which gives you plenty of extra material to trim off if needed. What they don't tell you is that they are side specific...there is a left and a right tube.

    Brady A.

    Helpful (4)

  • 5/5

    December 08, 2011

    Flow tubes with m-80s

    Installed these with a set of m-80's. With an offroad X-pipe the engine sings without choking. Bolts right up to existing midpipe and fit right in to the the Pypes m-80 mufflers with some 2.5" clamps. This setup flowed so much better than the old chambered mufflers on my boosted mustang that I had to retune.

    Ohforstang

    Year: 2004 Submodel: GT

    Helpful (3)

  • 5/5

    November 23, 2016

    94 GT

    These follow tubes make life easier when dealing with mid pipe.

    specs2010

    Year: 1994 Submodel: GT

    Helpful (2)

  • 5/5

    September 12, 2016

    Review for tail pipes

    I totally would so make the same decision again I am over pleased with the whole purchase

    Mustangman25

    Year: 1989 Submodel: Other

    Helpful (2)

  • 5/5

    June 10, 2016

    Awesome fit

    I installed a new BBK H pipe and BBK Varitune muffler and these pipes were just the thing to bridge the gap between the two units. Fit was perfect and installation took less then 30 minutes. They are a awesome quality product. Shipping was fast and everything came packaged well.

    jeff1986

    Year: 1986 Submodel: GT

    Helpful (2)

  • 5/5

    May 17, 2016

    Great fit

    Perfect fit for install. Great purchase. I wanted a cat back but didnt want American Thunder. I wanted the original 40's. So I bought the kit on ebay plus these.

    CopNaStang

    Year: 1989 Submodel: GT

    Helpful (2)

  • 5/5

    December 07, 2011

    Good product.

    I damaged the old flow tubes while crossing a construction spot in the road and got these for replacement. These fit like they are supposed to and were a quick fix to my problem. Good product.

    Red03

    Year: 2003 Submodel: GT Humble, TX

    Helpful (2)

  • 5/5

    August 28, 2017

    Flow tubes

    Perfect fit bolt right up. Made install.so much easier. And if ever need to remove its simple cant ask for more then that

    CarlosS

    Year: 2002 Submodel: GT

    Helpful (1)

  • 5/5

    February 26, 2017

    Great fit

    Ordered these for my upgrade to 2.5 inch exhaust and it was direct bolt on no welding used old hardware.

    NicholasL

    Year: 1986 Submodel: Other

    Helpful (1)

  • 5/5

    February 20, 2017

    Perfect!

    I have no complaints with this product. I would buy thsee again!!

    01BullittAZ

    Year: 2001 Submodel: Bullitt

    Helpful (1)

  • 5/5

    January 28, 2017

    Best For the Best

    Great Fit, Bolded right to the mid pipe and fit in the muffler inlets Would recommend when purchasing aftermarket mufflers

    Luke

    Year: 1989 Submodel: LX

    Helpful (1)

  • 5/5

    October 25, 2016

    Flow Tube Replacement

    Pipes fit fine, easy to change mufflers without replacint cat back system

    Rjbmach

    Year: 1995 Submodel: Cobra

    Helpful (1)

  • 2/5

    May 02, 2016

    2000 v6 mustang

    Did true dual to my 2000 v6 mustang the bending in this fitted weird with the Mac o/r h-pipe ended up scrapping them..might work with others but didn't work for me it's good material but wasn't for me

    Eddie7373

    Year: 2000 Submodel: V6

    Helpful (1)

  • 5/5

    October 26, 2015

    pypes flow tubes

    Perfect replacement tubes! Not a complaint to be had with these.

    Lee

    Year: 1997 Submodel: Cobra Summerville,S.C.

    Helpful (1)

  • 5/5

    December 09, 2011

    Pypes flow tube

    Great product! i used these on my 04 GT when i did my exhaust. They fit great and the only thing you might need to do is cut them to length but other than that the pre-bent tubing is perfect. This item is a must have if you want to keep that 2.5in flow from your x-pipe to your mufflers which is important.

    James04

    Year: 2004 Submodel: GT

    Helpful (1)

  • 5/5

    December 07, 2011

    good product

    no trimming needed for my 1985 , i did the full exhaust and needed these for it thanks am!!!!!

    kyle1985Mustang

    Year: 1985 Submodel: GT sherwood park , AB

    Helpful (1)

  • 3/5

    November 15, 2017

    Too low

    These tubes had too much bend for driver side. Which made my Hooker Aero Chamber muffler hang low. My 5.0 has an auto trans and Bassani stainless off-road X pipe. I used different ones for my app.

    93Stang

    Year: 1993 Submodel: LX

    Helpful (0)

  • 5/5

    September 11, 2017

    Flow tube review

    Excellent fit. Truly a bolt on install. Solid construction.

    Stroker

    Year: 2001 Submodel: GT

    Helpful (0)

  • 5/5

    September 09, 2017

    Great

    They worked perfectly it helped make it sound great

    SteveR

    Year: 1995 Submodel: GT

    Helpful (0)

  • 5/5

    August 22, 2017

    Replacement flow tube kit

    They fit perfectly on my 1987 LX mustang. Bolted on to the H pipe and had them welded to the mufflers

    DonG

    Year: 1987 Submodel: LX

    Helpful (0)

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