So I've only had these for a few months but these were the nicest sounding test pipes I could find, they sound just like art pipes and they have the same quality as z1 motorsports exhaust components, they perform way better than cats and sound as good as high flows if not better and they don't pop codes. Easy to install and ready for header paint out of the box, they come with all hardware and they look like they mean business. No fitment issues, just hammer the studs above them before install.

I haven’t installed them yet but they seem to be high quality and I know that there stainless steel the welds are also nice

I love conceptzperformance. Spoke with Nick and he helped me with my order. Knowledgeable and friendly love talking to those guys that concept Z. Took my order a couple hours ago and it’s already shipped out. awesome

Warm idle and cruising is quieter than stock cats. Sounds aggressive but at 3k rpm up its ball bearings in a tin can. Probably my cat-back's fault. A resonated y-pipe would probably go a long way. Had some fitment problems. Driver side resonator would impact the heat shield (stud cut off), passenger pipe was welded too far in. Difficult to get y-pipe on. Fought to use warranty, but the second set was basically the same. Used the best fitting of the two sets. Material and welds are high quality.