Actual ZL-1 Horsepower.

[GRB]

Does anybody know if the GMMG chambered exhaust is as restrictive as the OE GM exhaust? If it is I've got to start making plans to get the GMMG system off my 02 ZL1. Since I last posted we have decided to put a SC on the car. Of course when we dyno the car with the Kooks headers open and then closed we will know for sure. Something tells me we should go ahead and plan for a different exhaust system now. Any thoughts?? And I don't care for the duals that dump over the rear axles. Gotta go all the way out the back for me.