Exhaust Dumps
Senior User
Joined: Jun 2006
Posts: 328
Likes: 0
From: saskatoon,sask
i've always thought about having a y before the muffler with a 2 1/2 " ball valve easy to open and close but never tried it.
check out purple hornies mufflers the have a straight through pipe with a removeable cap the other pipe is muffeled for street use.
check out purple hornies mufflers the have a straight through pipe with a removeable cap the other pipe is muffeled for street use.
Elder User
Joined: Feb 2007
Posts: 829
Likes: 1
From: Goose Creek SC
Summit and Jegs sell them........"cut-outs".....generally in the racing section. Pretty common for daily drivers at the local drag strip back in my day... and I still see some at our local strip here. They mount in various places ahead of the muffler.......some have a switch now to open and close.....old style we just reached under and unbolted. sposedly illegal for "street use" now I think.
Good Luck
Probly could make your own if you have a torch and welder
Good Luck
Probly could make your own if you have a torch and welder
Last edited by 92F150Flare; Mar 29, 2007 at 06:59 AM.
Post Fiend
Joined: Jan 2001
Posts: 5,121
Likes: 1
From: Springfield, VA
I have a dump on my 95 F-150. When I had the exhaust done at my local race shop, we talked about the best placement of how the dumps would go to give me the best performance. We ended up going with a single 3" dump right after the y pipe and before the cat. I mud bog the truck and have events where I need to have a full exhaust in some classes, so I cap it for those and leave it uncapped for all the rest. The big thing you need to keep in mind is that you need to make sure you leave enough room after your O2 sensor so it reads properly for your EFI, which again is why mine is after the Y and not in it as my truck is a speed density with only 1 sensor, as opposed to my buddies Bronco, which is a Mass Air with 3 sensors from the factory.
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Junior User
Joined: Jan 2007
Posts: 91
Likes: 0
I think I'd rather do it after the cats because I don't want it to sound too beastly. Then it would feel straight poser since I don't have any aftermarket stuff on it yet except port matched heads. Thanks for the info though, I'll be looking that up at Jegs to see what I can find.
