Question for all those with after market systems.. had new zorst fitted today..gone for single exit rather than original twin and had it de-catted too...now i can't make my mind up whether its better or not..theres more noise which gives impression that revs are more than they really are...i dunno if car is slower on acceleration..or if torque curve is flatter ,seems very torquey low revs..and don't get so much take off at 4k rpm...