This is the best designed rear shock tower brace ever available for the E46 M3. We commissioned John Mason, previously a chassis fabricator with the Newman-Haas Indy car team, to help us bring to market a product that would stiffen the rear and add protection against mushrooming for the rear shock towers. I wanted something that would be strong, functional and easy to install and remove for those of ust who occasionally need full access to our trunk. We feel we have added a host of great features and eliminated the design flaws found in other rear bars

Why are there 4 mounting points?
The other bars previously available have mounted using only 2 points. This creates a hinge. The other bars might prevent the shock towers from flexing closer together or spreading apart, but don't prevent the towers from flexing the same direction. This concept is known as racking. The other bars are not nearly as stiff or strong as the BPS Motorsports Rear Shock Tower Brace AND they are not adjustable.

High-Quality Hardware:
My original idea was to use sea-post binder bolts for the easiest installation and removal but, to my dismay, I found the largest of those bolts is only 6mm. We felt that 6mm isn't strong enough to provide the rigidity we were looking for from this brace.

Tell me about the end brackets...
The end brackets on our rear shock tower brace wrap around and bolt to the inside of the rear shock tower in two places. Each of these bolts can handle 1200 pounds in sheer. This distributes the load over more of the rear shock tower. Rear shock mounts are helpful, but that can't compare to the protection provided by a set of RSMs AND our rear shock tower brace.

So, what else is different about this brace?
We made it adjustable. Why? Because we found our original design sometimes had fitment issues. Some of the cars we tested on were out of spec, so we went back to the drawing board. Also, based on talking with customers, we found that some guys wanted the ability to pre-load the rear suspension. The answer...make it adjustable. This killed two birds with one stone. NOW, the brace is guaranteed to fit perfectly AND hardcore track guys can adjust till their heart's content.

Features: