BORLA R&D Engineers have developed a sophisticated, unique exhaust for the 745i 745Li 4.5L V8 for 2002-05. This system (PN 140130) is a true dual Cat-Back™ and incorporates a lead muffler that serves both to attenuate sound and balance pressure, similar to the X-pipes used on race machines. Augmented with two secondary mufflers and followed up with a rear muffler assembly, the system exits with two turned down phantom tips at the rear valence driver side. Among the amazing qualities of the BORLA system: With all the extra tubing and mufflers, this system flows an unheard of 300+cfm more than stock and weighs in at an amazing 21 pounds less than stock -- a true testament to BORLA engineering which also accounts for the performance gains. The Li model is longer, requiring an extension pipe (included in every system). Performance, looks, better mileage and the right sound….what’s there not to like!