or as low as $66.66/mo with Affirm
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|Performance Engineering Since 1988
First is our Alignment dowel kit. This fills the factory bolt hole voids with CNC machined delrin inserts that will
square up the rear subframe to the chassis. By filling these voids we are also limiting the side to side and front
to back movement of the subframe that is present under hard acceleration and braking. Second is our tried
and true IRS Subframe Bushing Support System. This 8 piece kit was a first of its kind in the per formance
aftermarket and so innovative and popular we patented its design! Made in-house from billet 6061 aluminum and
featuring stainless steel hardware, this kit fills all the factory voids in the IRS subframe mounting locations. Its
job is to prevent up and down movements of the subframe. The 3rd component of this kit is the strongest support brace for the S550 IRS on the market!! Made in house from
chrome-moly steel, this brace is designed to support the factory subframe by directly tying it into the chassis at
key mounting locations. Using factory mounting locations on the factory frame, this 5 point brace supports the front
factory mount and the lower control arm mount as well. A simple bolt-in design, this brace ties the subframe to the
chassis in the best possible way. The 4th piece is Steeda's Adjustable Differential Bushing Insert System. These polyurethane bushings replace the
soft rubber factory bushings that result in pinion changes, differential movement, and wheel hop. This will improve
handling by helping to keep the rear of your Mustang connected. You can expect some increase in NVH and may
experienceincreased
transfer of gear whine noise problematic to some Super 8.8 IRS differentials.
NOTE: Steeda IRS Subframe support braces will not fit convertible.
Find outwhich Stop The Hop Kitis best for you!
You'll get an instant confirmation email with your part details and invoice. We source from a network of authorized suppliers across the country, so lead times vary by brand and part type — we'll send a tracking number the moment your parts move.
Made-to-order builds — carbon fiber bodywork, fabricated systems, custom finish work — run longer than off-the-shelf items because they're built per order. You'll get progress updates throughout the build.
Need a specific timeline on a part before you buy? Call 805-267-9762 or hit the chat — we'll check vendor stock direct and give you a straight answer.
Absolutely! Once your order ships, you'll get an email with a tracking link so you can follow its journey from our shop to your doorstep.
If your order ships via freight, you'll get a separate email with a direct link to the carrier's tracking page — easy and stress-free.
Things happen on the road — even to boxes. If your order arrives damaged, snap a few clear photos of the box and product and send them our way right away.
If your shipment is lost, just email or call us — we'll help track it down and guide you through the next steps to make it right.
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Your feedback helps us grow, create more content, and keep bringing performance-driven parts to the community. 🏁
or email Support@FFPerformance.co
Car parts can be a maze — good thing we brought the map. Our team's here to keep things smooth, simple, and maybe even a little fun.
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