aFe Exhaust Tip Upgrade 05-08 Porsche Boxster S (987.1-987.2) H6 3.4LaFe Exhaust Tip Upgrade 05 08 Porsche Boxster S (987. 1 987. 2) H6 3. 4L aFe is proud to introduce the aFe MACH Force Xp dual tip assembly for the 2005 2008 Porsche Boxster S and 2006 2008 Cayman S (987. 1). 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,