yea mines a 4.6 and i ran jus cats for a couple days but it got old and wasted gas cuz i jus floored it everywhere cuz it sounds so cool lol
i just had a straight pipe on my old screw like he has now ...... it stops right bout the middle of the cab
mines 54 and its got the cats still...it had a coupling in it and i took it apart there....i love the way it sounds...