Used carb cleaner on everything before install. Had some metal shavings from manufacturing in all the pipes and headers. Also a bent bolt on the clamp for the hi-flow cats. Quickly fixed and strengthened bolt out. Also got a pre-bent one of the bolt locks for the header bolts. Made things feel like I got a quality reject set of header bolts, hi-flow cats and mid-pipes. The headers themselves are in tip top shape. Luckily I got everything to work and come together nicely and the sound is amazing you can feel gains pre tune.. The install issues do not reflect on Bylt whatsoever. I suggest buying high temperature tape zip tying extension wires to a safe location. Bylt is also there to help you with any answers or concerns you have during self install. My stars have only to do with kooks not checking the cat clamp bolt being bent, and fixing that issue added an hour to install.