Supersprint utilizes its direct flow resonated tube system on this muffler as they do with all their mufflers. This design allows the most direct passage of exhaust gases while maintaining the proper back pressure for maximum performance throughout the RPM range. This system is a center exit system which requires the rear bumper skirt to be trimmed. Requires removal of spare tire assembly. Emergency tire inflation bottle is recommended. (MINI Part # 71 10 1 153 784 or any equivalent.) Weight savings for spare tire removal and exhaust replacement is approx. 30lbs. Tips sold seperately.