If you own an E46 (01-05 3 Series), chances are your rear floor pan, where the subframe attaches, is likely cracked. This kit designed by Turner Motorsport is the ultimate fix and was developed during their time racing the E46 chassis with World Challenge.
This rear chassis/subframe reinforcement kit is designed to be welded into place (NOT epoxied). This helps strengthen the floor to prevent further damage to your car which can end up in costly repairs.
***Nuts & Bolts Performance highly recommends that this job is performed by a professional with very good welding skills***