The ones I just put on are dual tips, look at the pics of the blue C5 earlier in this post. I'm guessing thats what your talking about. Hope this helps.

 

Yours is a quad

 

Your right, my bad. I meant dual on each side. Thanks

 

Good info guys! I will check into a single tip. Only downfall is really the majority of those out there like the quad tips, but I will certainly check it out if there is interest/demand!

 

I had my XSPower catbacks installed Friday and I be liking 'em. I was getting kinda annoyed that my wife's stock Yukon sounded better than my car But all is good now! I am glad though that I had a local shop install it. They did have problems with the provided clamps (one broke and one stripped). They tried some clamps they had and they were still concerned that it wasn't tight enough so they went ahead and welded a bead where the muffler connects up to the pipe. Attached are videos before and after. I took them with my phone so ....... but you can still hear the difference.

 

^^^ you need a x pipe