Honestly, there are enough systems on the market that there is NO reason you should be getting a system that needs to be cutting the stock system.
'08 E92 SG M3: AA G2L3 snail, Catless X-Pipe & Sig Series Rear. AP rods. TC Kline EDC Coil Overs. MRF Alum Sub Frame Bushings. TMS Delrin Diff'l Bushings. BFI Motor Mounts. Recaro PP's. BMW Elec Perf Steering Wheel. P3 Vent Gauge. PS Overflow Kit. LUX V3. APEX ARC-8 18"x9.5"/10.5". Conti Slicks 275/35F 305/30R. Stoptech Pads/SS Lines. Castrol SRF. Cantrell Motorsports Brake Duct Kit.