aFe Power • MSRP: $595
aFe Power has announced a new downpipe for the N55 3.0L six-cylinder turbo engines in the 2011-12 BMW 1- and 3-Series models. The Mach Force XP downpipe is constructed from mandrel-bent, brushed 304 stainless steel tubing and flanges. It’s been designed to affix to the factory mounting locations. The fully TIG-welded downpipe produces an aggressive tone on throttle, but is said to have a smooth sound at cruising speed, thanks to a unique resonance chamber that apparently minimizes drone without affecting performance. The company’s in-house dyno has produced claimed figures of 14hp and 39 lb-ft over stock.