i bought a megan racing stainless header for my teg got it outta the box everything was awesome and then the nightmare to install it, the angle that that downpipe had made for a shiity seal to the cat, and tegs don't come with that nice braided stainless flex pipe, i guess they figured theres no torque so no flex, but anyway once I got it in there it also wouldn't fir on to the 2 mounting bolts that hold it up near the oil pan, if I forced it up in there it would just bind and prolly would've heated the oil up to 3000 degrees, so I hammered the mounting bracket down on the header, it now acts as a spacer and keeps the downpipe from buddy f*&kn my oil pan. Dunno if that helps but that is just what I did.