Hey I was curious if I could get some opinions on this exhaust system. Sound, performance, fitment. Would you recommend it for a build?
I honestly think its one of the best exhausts on the market.
As do I! However, I only have experience with the 2.25" catback which is a little small for FI. There is a 3" kit available and if I had the funds I would get it without hesitation.
I have the 3" catback, and although I have yet to boost on it, I can say that the fitment is excellent, and the sound is awesome…its really deep and not raspy at all…I love it and cant wait to hear it roar on the dyno 
a local g2ic member had their normal n/a exhaust and the piping rotted out. first time i ever saw that on an aftermarket exhaust.