my e36 m3 , 1996 on the dyno @ PPE, power plus engineering engine full stock, just got maintenance @ PSG performance shop geel (belgium) exhaust system: supersprint x-pipe street + supersprint rear exhaust street results before tuning 305pk @ 7831rpm 348nm @ 5311rpm results after tuning 345pk @ 7645rpm 362nm @ 5697 totally different car!!