[KingLT1]

I would buy TSP headers before Kooks...Nothing wrong with Kooks, but TSP are right there with them on quality for a lot less coin. My brother installed TSP headers and SE X pipe into Stock NPP on his ZL1. It's super quiet with valves closed even with no cats. The stock muffler sounds a little tinny but it's not terrible. The SE X pipe hangs a little lower then my Borla and you need to replace the supplied clamps which I also did on my Borla 60608. Other then that the setup from what I have seen is hard to beat for the money. You can spend under a grand on this TSP/SE X pipe kit or spend 3k on a Kooks or ARH system...they all going to perform the same. The ARH will be guaranteed fitment vs the cheaper headers where 1 out 10 might have a clearance issue of some sort. That is about all you remove from the equation when buying a top dollar header system.