Has anyone used the gbodyparts Hot Air 3" Downpipe? If so, any comments regarding fit? My concerns are how close it comes to the heater/AC box and also the ability to change spark plugs. Any close up pictures (or pictures in general)? I have a 2.5" but I am thinking about upgrading to the 3" but if I'm shelling out the dough, I want the fit to be nice. Thanks