aFe Power # 48-36315-HC is a Twisted Steel Down-Pipe, Street Series that fits 2016-17 BMW M2 (F87) L6-3.0L (t) N55 (more applications listed below pic available via Marken Performance). This down pipe has a unique 3-1/2" to 3" stepped design that is used to increase exhaust velocity and increase usable torque. It is constructed of mandrel-bent, brushed 304 stainless steel tubing for maximum performance, corrosion resistance and strength eliminating cracking. There is a 400 CPSI (cell per square inch) catalytic converter for maximum flow. 
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