Originally Posted by Sgreg

Tim-

IMHO, you owe it to yourself to take a ride in a couple of Z's that have different exhaust systems. HP is not the only consideration. Each has a different sound and level of resonance. The big three that almost always show up are B&B, Corsa and Flowmaster. There are others as well. Try to get a ride in each. Bottom line is there is a marked difference in sound and resonance between the three. They all give better than stock performance with minor mods you are proposing. And they all are louder than stock.