so I purchased a cuda that was build in the early 2000’s it was torn down and body work was fixed. It came with a real nice 3” tti exhause that was welded. Only problem is the car had headers and I want to run HP manifolds. So I called tti and they told me they could make me some head pipes that went from 2.5 to 3”. So I got them ordered and delivered. I was not sure what to expect dealing with a almost 20 year old exhaust and new pipes. It went together perfectly not one issue. I am not sure if this is common but I just wanted to take a min to say how impressed I was with the fit and finish of new and old stuff from them.