Stage 1.5 - E46 Chassis Rail Plates
If you've done your research on E46 subframe mount/RACP failure you've very likely seen the horror stories where the boot floor is flapping up and down and completely separated from the chassis rails. This is simply because the hollow section the subframe bolts to does not connect to to the frame rails of the car or anything else that could be considered structural. Instead, it shrinks down to a single layer of sheet metal towards the wheel arch.
Even with underside reinforcement plates installed you aren't safe from this as you cannot correct one of the biggest design flaws from just underneath.
We've done our best to bridge the weak points with our underside plates however, for those looking to more comprehensively reinforce their E46 chassis without blowing the budget, we have designed this cheap yet effective and completely hidden solution to prevent any chance of that ever happening.
This product closes the gap (pic 3) providing a direct transfer of stress from the carrier panel to the frame rail preventing the boot floor from separating from the chassis rails permanently while simultaneously providing a noticeable increase in chassis rigidity.