Cat back systems are expensive for some reason. I bought the cheap $84 stainless shorty headers off Amazon(which are actually better quality than most top name brands btw), a cheap stainless OR x-pipe off eBay(fit was pretty good), and made my own “cat back” with flow tubes, band clamps, Pypes mufflers, and clamped hangars on the other ends. It all fits perfectly, sounds amazing, and the total cost for everything was less than $500. No welding required!