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KONI STR.T Shock, Strut & Eibach Pro-Kit Lowering Spring Kit (11-14 GT, V6, BOSS)

Market Price $849.99 You Save 26% ($223.59)
Our Price

$626.40 (kit)

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  • Item 390837
  • MPN# 1125 1092

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Features, Video & Details

  • Complete Suspension Kit
  • Improves Handling Performance
  • Aggressive Muscular Stance
  • Front Drop Up to 1"; Rear Drop Up to 1.5"
  • Progressive Spring Rate
  • Non-Adjustable Shocks and Struts
  • Twin-Tube Gas Pressure Design
  • Fits 2011-2014 GT, V6, and BOSS Mustangs

Review & Installation Video

Review & Install Video

Hey, guys, Stephanie with americanmuscle.com, here with the review and install of this handling pack that pairs KONI's STR.T Shocks and Struts with Eibach's Pro-Kit Lowering Springs for 2011 to '14 GTs, V6s, and Boss Mustangs. In this video, we're gonna talk about a few different topics when it come to this handling kit. We're gonna talk about the performance and handling benefits of the kit, and, of course, we'll cover the install. I'll go over the install in more detail later on, but I can tell you right now that the install for this kit is easy and straightforward, but it is a little bit of work. So I'm gonna call it a two out of three wrenches in the difficulty meter. The KONI STR.T Shock and Strut, and Eibach Pro-Kit handling package is going to be for those of you out there that are looking for a handling package that'll give you an entry level upgrade with non-adjustable shocks and struts and a set of progressive springs that'll drop the car up to an inch in the front and one and half inches in the rear. This kit is perfect for those daily drivers that are performance-minded and want a little bit more from their handling. For guys who are looking for more of an upgrade or to upgrade maybe some other handling components, there are some other kits that you can check out that will give you a little bit more depending on what you're looking for here. We do have a couple of things to talk about here since we are looking at a big kit, but the first thing that I wanted to talk about is the KONI STR.T Shocks and Struts. These are considered the entry level option, and I mean entry level in both price and performance. These are KONI Orange, which is one step below the KONI Sports or the KONI Yellows. Even though this is entry level kit, you are getting a bump in performance over your stock components. Now, while these are performance-oriented, you aren't getting the most performance-based kit with these here. These are non-adjustable as opposed to the adjustable options that you have. That means that they have a fixed rate of dampening, and these have the standard twin-tube gas-pressure design and steel body. Well, like I said, these are still an upgrade over the factory shocks and struts. If we move on to the Eibach springs, these are the Pro-Kit springs, and they are a progressive spring, which is gonna make them a good option for the street cars that are out there. The springs do offer a range of drop depending on your exact model. If you have a GT, no matter if it's a coupe or convertible, you're looking at a drop of one inch in the front and one and half inches in the rear. The V6s can expect 0.8 in the front and 1.2 in the rear, and the Boss Mustangs can expect 0.6 in the front and one inch in the rear. I will say that it's normal to have a settling period with lowering springs. So if the initial drop is less than what you'd expected to be, just know that these springs will settle a bit with some time, and the car will drop a little bit lower. The springs, and shocks, and struts work hand in hand together. And, normally, if you're upgrading one, you are upgrading the other. So having a kit like this one here, with two well-known brand names, is always a plus. And any quick research on the forms will tell you that this kit is a popular kit and that these things really do work well together. If you wanna take things a step further, you can always upgrade your strut mounts, and you'll have a car that feels totally different. As far as price, you're looking at spending under $750 for this kit. You do save a little bit by purchasing these together in a kit, but you can always buy the parts separately as well if you don't wanna spend everything all at once. And this is price lower than the kit with the adjustable shocks and struts, but keep in mind that this is your base upgrade. There are a ton of different handling kits that offer different components depending on what you're looking for. So if you need something more than

Improved Performance. Give your S197 Mustang a suspension upgrade and make your next drive exhilarating. Tighter steering, sportier handling and a more aggressive appearance are all yours with the KONI STR.T & Eibach Pro-Kit. The set includes KONI STR.T Street Front Struts and Rear Shocks as well as progressive rate Eibach Lowering Springs.

Full Handling Kit. KONI's STR.T & Eibach Pro-Kit is the perfect starting point for the budget-conscious driving enthusiast. The entry-level STR.T Series Shocks and Struts from KONI offer the superb engineering and workmanship that KONI is known for, but in a design that makes for a wallet-friendly price point. The Pro-Kit Lowering Springs by Eibach provide a nice drop that improves overall stance without the harsh ride some other springs provide. Bundled together, the combo is a great value for daily drivers and performance minded folks alike.

Quality Construction. Complete with a gas pressurized twin-tube design, the KONI STR.T Shocks and Struts feature a durable orange finish and a larger diameter piston for optimum street performance. These non-adjustable dampers are great stock upgrades and also perfectly complement the included Pro-Kit Lowering Springs. The progressive rate springs provide a comfortable ride while lowering your center of gravity, offering better handling in curves and a reduction in nose-drive under hard braking situations.

Installation Tips. This Handling Package installs directly in place of your stock components and comes with everything you'll need, including illustrated instructions. A full 4-wheel alignment should be completed after installation. The initial drop may appear be less than expected, but springs will settle farther given a bit of time. Expected drops vary by model and body style:
  • Lowers 2011-2014 GT Coupe: Front - 1.0", Rear - 1.5" 
  • Lowers 2011-2014 GT Convertible: Front - 1.0", Rear - 1.5" 
  • Lowers 2012-2013 BOSS Coupe: Front - 0.6", Rear - 1.0" 
  • Lowers 2011-2014 V6 Coupe: Front - 0.8", Rear - 1.2" 
  • Lowers 2011-2014 V6 Convertible: Front - 0.8", Rear - 1.2"


Application. This STR.T Shock, Strut & Eibach Pro-Kit Lowering Spring Kit is specifically designed to work with all 2011-2014 GT, V6 and BOSS 302 Mustangs.

Fitment: 2011 2012 2013 2014 Details

What's in the Box
  • (2) STR.T Front Struts
  • (2) STR.T Rear Shocks
  • (4) Eibach Pro-Kit Lowering Springs
Installation Info
Tech Specs
Lowering Spring Specifications
Spring Rate: Front: NA lb/in.
Rear: NA lb/in.
Usage: Street
Year: 2011-2014 GT, V6, BOSS Model: Coupe & Convertible
Progressive or Standard: Progressive Estimated Drop: 1.0" F / 1.5" R
0.8" F / 1.2" R
0.6" F / 1.0" R
Will it fit my Mustang?
  • GT - 11, 12, 13, 14
  • V6 - 11, 12, 13, 14
  • Boss 302 - 12, 13

Not Compatible with GT500

People Who Bought This Item Also Bought

Most Helpful Reviews

5/5
WOW!!!! what an amazing upgrade!

Came from stock struts/shocks and springs.. 70k miles.. about time for new ones.. and why not get a better set? WOW!!! amazing difference in handling! Lowered the car about 1" to 1" 1/2"... had to ...

Read More
Helpful (1)

5/5
Eibach/koni combo

Kit for well and creates a firm more confident ride. I only hope the rear of the car settles down lower after a couple of days, as it is still noticeably higher then the front. I'm very pleased with the ...

Read More
Helpful (1)

Overall Rating 5 out of 5 stars
Read All 6 Reviews

Customer Photos (5) Submit Your Photo

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5 Questions / 5 Answers

Ask a Question

Will this work if paired with gt500 strutmount on a gt/cs coupe?

GerardoL

  • The 2011-2014 Mustangs require the use 2005-2010 Ford Performance lower springs and struts/shocks for proper installation. The KONI STR.T Shock, Strut & Eibach Pro-Kit Lowering Spring Kit will not work with the GT500 Strut Mounts.

    AMBob

Helpful (0)

Would the Camber Bolts do the job for the alignment for this kit or would the Caster/Camber plates do better? But I also don't want to spend more then what I have to.

GerardoL

  • Hello, As a general rule of thumb, any drop 0" - 1" camber bolts should be sufficient to correct the alignment. 1"+ drop it would be recommended to purchase caster/camber plates. With that said, it can be difficult to say exactly whether or not you will need caster camber plates for your application, to correct the alignment. This is because the estimated drop for each model varies slightly. Lowers 2011-2014 GT Coupe: Front - 1.0”, Rear - 1.5” Lowers 2011-2014 GT Convertible: Front - 1.0”, Rear - 1.5” Lowers 2012-2013 BOSS Coupe: Front - 0.6”, Rear - 1.0” Lowers 2011-2014 V6 Coupe: Front - 0.8”, Rear - 1.2” Lowers 2011-2014 V6 Convertible: Front - 0.8”, Rear - 1.2” I can say for certain that caster/camber plates are not required to install the kit, and therefore you may use the camber bolts. However, if the car is unable to be returned to an acceptable caster/camber spec. Then you would want to invest in caster/camber plates to give you the additional adjustment needed.

    JoshMR

Helpful (0)

Just wondering if using the lowering springs.. will I need to update other components? bumpsteer kit?

Rebelfag68

  • The KONI STR.T Shock, Strut & Eibach Pro-Kit Lowering Spring Kit will not require the addition of any additional components. We would recommend the Eibach Pro-Alignment Camber Adjustment Bolts, Item 47815 for an increase range of adjust-ability when the vehicle is being aligned. http://www.americanmuscle.com/eibach-proalign-bolts-0512.html

    AMJEFF

Helpful (0)

Sir this kit is the kit just for the 2011-2014 Mustangs? Correct? So I can use my Stock Strut Mounts? Thanks

pugster

  • You can use your stock strut mounts with this shock, strut and Eibach pro-kit.

    KevinD92

Helpful (0)

I have a 2012 5.0 GT. Do I need a panhard rod (like with the SR brand) with this kit or do I need any other parts for installation?

Sam

  • A panhard bar would not be needed for the installation but is highly recommend when lowering the car to help realign the rear end.

    Ricky36

Helpful (0)

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Customer Reviews (6) Write a Review

Overall Rating 5.0

out of 5 stars

Installation Time:Full Day

Installation Cost:$250-$500

  • Handling Improvement 5 5
  • Fit 5 5
  • Bang For Your Buck 5 5



  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    March 23, 2017

    WOW!!!! what an amazing upgrade!

    Came from stock struts/shocks and springs.. 70k miles.. about time for new ones.. and why not get a better set? WOW!!! amazing difference in handling! Lowered the car about 1" to 1" 1/2"... had to have some front end work done, so had the shop change out the struts/shocks at same time... Love the height (didnt hate the stock height).. and the car feels so much more like a sports car!

    Rebelfag68

    Year: 2013 Submodel: V6

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    November 17, 2016

    Eibach/koni combo

    Kit for well and creates a firm more confident ride. I only hope the rear of the car settles down lower after a couple of days, as it is still noticeably higher then the front. I'm very pleased with the kit, but a couple of the springs had rub/chip marks from shipping.

    Blue2012GT

    Year: 2012 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Weekend

    June 27, 2016

    Awesome

    If you haven't already trolled the forums and read about these, here it is. They are awesome. combined with the right spring and new strut mounts, they totally transform the ride. Highly recommend these.

    mustang50

    Year: 2013 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    August 10, 2017

    Excellent Value

    Wanted to lower the car a bit, which it did as specified. Felt the difference in height as soon as I sat in the car. What I didn't expect, though, was how much more planted the car felt on the road. You will need the camber bolts for this kit. I also had an adjustable panhard bar installed. My 2011 V6 rides so much better now.

    GeologistGuy

    Year: 2011 Submodel: V6

    Helpful (0)

  • 5/5

    Installation Time: Afternoon

    August 05, 2017

    Perfect !!!

    I order the KONI STR.T Shock, Strut and Eibach Pro kit Lowering Spring Kit ( 390837 ) , delivery direct at my door in Québec, Canada. Perfect fit during installation. The car il lower on tires, better handling. Very happy with this kit. Needed about 4 hours for installation.

    MartinS

    Year: 2013 Submodel: GT

    Helpful (0)

  • 5/5

    Installation Time: Afternoon

    May 05, 2017

    Definitely a Noticable Difference

    When I first bought the kit, I didn't realize how much the car would be lowered. I expected it to be just a minor stance and nothing really noticeable. However, there was a major difference in the way the car sits. It looks great though and I really enjoy how it handles now around corners. Definitely worth the money for the kit. I would suggest getting camber plates with it to adjust the kit.

    Shogun

    Year: 2014 Submodel: V6

    Helpful (0)

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