I'm looking at fitting coilovers to my E46 M3 (Intrax 1K2) and want to make sure I strengthen the car appropriately. I know you guys are the top team for suspension setup so I have a quick question if I may: On the front I am going to fit Turner Motorsport plates to the strut tower. On the rear I am also going to fit Turner Motorsport plates to the shock tower. I have a front strut brace already (standard M3 OEM). And now for my question: For the rear I think a strut brace would also add more material to the shock mounting point (as it is now going to support the weight of the car (being proper a coilover). Do you think I should consider a rear strut that also braces to the rear subframe mounting points or would just a rear brace be fine with the rear coilovers? Two I have seen are: Safety Devices: http://www.sportseats4u.co.uk/images/uploads/Safety-Devices/B028/B028-Rear-Brace(2).png Mason engineering: http://www.masonengineering.net/images/E36threepc.gif http://www.masonengineering.net/images/E46Rearsubframesupport.jpg http://www.masonengineering.net/images/E46rearX.jpg I think the SD one just bolts to the boot floor (with an extra plate to weld on first). The Mason one might actually bolt into the rear subframe mouting point (I think). Do you have any experience in this area - or am I worrying for no reason, and I don't even need to consider a rear strut brace, let alone a subframe support? cheers Rob.