turnaround im presuming u mean product quality? if so ma mates sister got an exhaust on her jeep from simons customs, sounds fantastic, customer service is also amazing as ive spoke to him myself and hes an amazing guy, really knows his stuff, as for C.A.S ive met a few people on with exhausts there and they never had a bad word to say about them either, they seem to get loads of business from the surrounding area.