Just did this same thing this past Tuesday. Wasn't a problem. Before the muffler shop started cutting, I took some measurement's with my finger, (LOL...very technical way to measure, but it worked)). I made sure when they tack welded the tips, before the final welds, that all lined up properly....it did. The clearence between the top of the tip, and the bottom of the bumper was one pointing finger to the second knuckle joint, and the sides of the tips were one thumbs width between the side of the tips and the surrounding bumper, and between the tips, the gap was also one pointing finger wide. Your measurement's may vary...depend's on your finger size...lol. Looks factory, but doesn't sound factory!

PS..now I'm trying to find that perfect set of new rims....what a headache!