100% stainless system for the MINI Cooper S 2004-2005 that bolts to the stock exhaust after the catalytic converter. Twin round tips fill out the rear valence perfectly with no rubbing. This system is louder and lighter than the Street system (140120) and features smaller mufflers and a high flow resonator than the Street system. Stock system weighed in at 45.5 LBS, the Race is just over 30lbs. With our in-house Dynapack Chassis Dyno, we tested many different exhaust systems currently on the market for the Cooper S. The Borla came out on top! Dyno results showed a peak gain of 6-7 HP power at 6250 RPM, but power increases from 3700 RPM all the way up to redline.