aFe Twisted Steel HDR X-Pipe SS-304 01-06 BMW M3 3.2L S54aFe Twisted Steel HDR X Pipe SS 304 01 06 BMW M3 3. 2L S54 Upgrade your Z4 M Coupe exhaust with the Twisted Steel 2 A?" race pipe. Mandrel bent from 304 stainless steel tubing for maximum exhaust flow and corrosion resistance, the mitered merge "X" pipe eliminates drone and maximize scavenging. This system delivers gains of up to +13 horsepower and +20 lbs. x ft. of torque when tested with PN 49 36339 exhaust and are 100% hand TIG welded for strength
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