aFe MACH Force-XP 4-1/2in Carbon Fiber OE Replacement Exhaust Tips - 15-19 Dodge Charger/HellcataFe is proud to introduce the aFe ELITE dual tip assembly for the 2005 2012 Porsche Boxster S (987. 1 987. 2) with the H6 3. 4L engine. In recent testing with the stock exhaust system, this aFe tip assembly resulted in a max gain of 16 horsepower and 16 lbs. x ft torque. Realizing that the OE exhaust tip could be improved, aFe designed a special dual 4" polished, aFe laser etched, 304 stainless steel, slash cut exhaust tip assembly that is more free