Got everything installed & have had a little time to drive it around. It's a definite improvement over stock. Still just running 10psi but it spools a little quicker. I imagine it would have been an improvement over usdm pre cats/mid pipes. I'm quite pleased with the gain over the stock setup & hard to beat for the money. I know I left some power on the table vs a good expensive setup but I only have about $400 in a full exhaust. Sounds pretty good too, nice & deep & not loud at all.