when they replaced my resonator (I guess because they cut it in 2 places), they replaced with a slightly larger pipe (in length). I can tell because where the y pipe joins to the resonator, it is sticking down a bit farther, and the joint (donut gasket) has no gap at the top, and a 3/8 or so gap at the bottom.) It is not leaking though. Is this a future problem? I guess it is especially if I am going to replace my y pipe.I would take it right back to them and not even bother typing this, but I really don't feel like sitting down there another hour or so 