dual exhaust, a lot of works are needed for it. but with price like that, better be worth it, that price is comparable to a real cat-back exhaust system, but those shop usually perform MIG welding instead of TIG. If you look at those cat-back exhaust system, they used TIG, the welding looked really clean. MIG welding is cheaper and TIG costs more. TIG works with stainless steel pipes. at the shop, they used a different type of pipe material, not stainless, so TIG does not work. MIG will start leaking over times. heck what am I saying? am I making any sense here? anyway, where do you live? check out this site:
www.streetsports.com