You bought the ep3 spec header and have an RSX-S spec exhaust. If you bought the RSX-S spec header you wouldn't have any fitment issues. I bought the OBX V2 ep3 spec header and it matches up perfectly to my ep3 spec exhaust(Apexi Noir). Just have your midpipe extended at an exhaust shop and you will be just fine, good luck.So ive finally gotten a chance to install my header. The install was pretty straight forward and it seems to clear the sway bar but unfortunatly the adapter piece is about 2" to short. Right now my midpipe hanger is very streched and the exhaust dosent seem very comfortable. So now im going to have to call my local muffler shops to have either my adapter piece or midpipe extended. But at least everything else seems pretty good for the price for what i paid.