At the same time, I reworked my Supersprint muffler installation. Under some conditions, the tips could touch the bumper cover. It was minor, and I'm told when the exhaust does burn into the cover, the plastic tends to melt inwards (away from view) and the pieces easily crumble off the car. And, because the SS tips are double walled, they never get super hot anyway. Regardless, melting the bumper is not OK with me. My fix was to remove a 6mm x 35mm triangle from the bumper inside corners. Then touch up the edge with paint and clear coat. Next, I reworked the exhaust hangers by adding steel plates I made with high-temp rubber washers. This restricts the exhaust from some side-side movement but does not affect forward-aft or up-down. Finally, I re-aligned the exhaust to use the added clearance better. Works like a charm. The tips cannot touch the bumper cover now under any circumstance.
I thought the SS exhaust sounded good before, and it sounds even better (less rasp) with the X-pipe. Next plan is to keep adding SS parts going forward, but it's going to get very expensive from this point on!!