Hey everyone. Sorry that I havnt responed lately. Bust with my internship. Anyways, i bought the Pypes kit from summit and the ultra flow welded. I went with these since they are still considered a race muffler and i wanted to most flow. part # WLK-17219. The x pipe didnt make it much quieter but the mufflers make up for any difference. at idle it still has a low rough sound but a louder at WOT than the super 40's. i did notice quicker throttle response and the sound is amazing. the new tips make it bark more than stock too since its not choked own at all. Clips will come soon and the Super 40's are going on my girlfriends 67' 302 Mustang. Junk has to go somewere right....haha