aFe Twisted Steel 3.5in. to 3in. 304 SS Street Series Downpipe BMW X5 M (F85) / X6 M (F86) 15-19 V8-4.4L (tt) S63

Up to +21 HP and +29 lbs. x ft. Torque max gains
3-1/2"- 3" mandrel-bent, brush finished 304 stainless steel tubing improves flow for proven gains and quality finish
Ultra high output metal core GESi catalytic converters
Heavy duty flex tubing with internal interlock liners
Factory mounting brackets, O2 and auxiliary ports and quality hardware for a direct fit install
100% hand TIG-welded for strength and durability
Product ID: 48-36321-HC