U have to realize first that the best computer calculated exhaust aftermarket tuning parts will only gain u 2HP max. 2HP max!!! What do u expect? The BIG difference is they will move the power band upper or lower. Hence changing revs or torque entry. U can dyno all u want. 2.5 HP max form a RM5000 exhaust system that changes the sound and where the power comes from. It is not worth it. Straight pipe without baffles or muffler or cat also will not gain u any more power increase than u want. Seriously big pipes are only useful for turbo cars because they can vent out more boost. That is why if u already have the PZ exhaust manifold, which probably changed the engine characteristic where power comes early, then there will be no gains to get from changing any of the mid sound baffles or rear muffler. Think about it. Eventually u go dyno before and after, u gain 1HP, but graph shows difference in where peak RPM and torque is reached.

Then u realize that an engine is like a vacumm cleaner. Having a big vent out makes no point if the suction is small. All that 2000watt of power wasted on not picking up enough dirt.

This post has been edited by netmatrix2: Mar 5 2013, 02:22 PM