Welcome to the site man! Yeah, LT's need some welding work, or if you would like, use the supplied band clamps to secure the y-pipe. The ORY will clamp to the collectors of the headers and then bolt up to the socket joint where it meets the catback. While you are off modding, set your programmer back to stock and sell that Hypercrap. With the proceeds, do yourself a HUGE favor and get a custom PCM tune. You'll thank me!