[Waltabeast]

The only thing I'd suggest is have him recheck the connections, or take it to another shop. I doubt the product is faulty. But still a possibility. Ask him if he switched over the stock acuators and connected to the vacuum source. There's also a break in period for a catback exuast, but from the videos I've seen you should've been able to hear a night and day difference right away from stock. Let us know what you find out!