





SLR Speed BMW E46 Rear Floor Subframe to Shock Tower Brace
SLR Speed BMW E46 Rear Floor Subframe to Shock Tower Brace
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This rear floor to shock tower brace closely follows how BMW Motorsport reinforced the factory E46 GTR and touring car shells into the rear floor/subframe location.
This brace performs several functions:
- Rear floor reinforcement to combat stress fractures at subframe mount locations
- Rear shock tower reinforcement to allow coil-over-shock (aka true coilover) installations.
- Lateral reinforcement and structural replacement after notching the factory floor crossbeam for Quick-change differentials.
- Longitudinal torque load distribution for less overall floor flex under hard acceleration (basically it stops the rearward subframe points from pulling down as the differential applies torque through the subframe)
Includes hardware to bolt into the rear floor/subframe threaded tubes, or you can use your own M12 all-thread to allow through-bolting with subframe below, plus nuts in cross bar feet.
INTERNATIONAL ORDERS: In Please be aware your country may charge import fees of up to 20% in some cases. If delivery is refused, return shipping costs us 4x the original shipping fee, so we will charge a 50% restocking fee. By purchasing you agree to these terms.
Let customers speak for us
from 266 reviews
Brian at FI Performance always goes above and beyond to take care of customers. I am a repeat customer and will continue to use them for all my needs. Thanks again Brian, amazing as always!

Exactly what I needed for my lowered C5. Full range of adjustment and quality made product.

Got a great product. In a very timely manner very happy

Great experience, order got messed up and Brian made sure to get it fixed and kept me up to date by texting me.

Exactly what I needed and had it next day

Customer service was great. Order shipped quick. Great value and the change to the car was better than expected. Wife no longer braces herself for the expansion joints and other Ohio road issues.

Brian was AWESOME to deal with, I changed my mind a few times on what I wanted to do with my c6z.. You can go down an endless rabbit hole when you get into these cars “while I’m in there “He was right there with updating pricing and I couldn’t ask for more.. Parts are parts and they will fail but it’s the service that sets the bar for a big purchase.. I haven’t driven the setup yet as it’s still being built but I’m sure he a phone call away to get it sorted..

Great customer service as always. Was on my doorstep within 48 hrs.

High quality parts with installation pics to come

Great support team helped me get the parts needed and got my order within the week.

Balancer was exactly what I needed. Everything as described and fast shipping. Thanks guys

Team went above and beyond to locate the part needed to get my can back on the road asap.

I finally got to install the intake which literally took 10 minutes. The power and launch difference was insane! You can hear the turbos spooling a lot better as well. I’m amazed by the difference just from the intake

Great product and communication.

I went with the super low, extended rear shocks , Swift 9/7k upgrade and absolutely love the stance and how the truck rides. It’s tight in the corners , smooth driving down the hwy and not bouncy at all. Thanks to Brian for getting me set up.