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Unread 11-23-2011, 08:42 PM   #1
czjeeper
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1992 YJ Wrangler 
 
Join Date: Jul 2006
Location: Washougal, WA
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3" exhaust system?

I'm looking to install a cat back exhaust system on my Jeep.
Now that I've got the 5.2 installed I would LIKE a 3" cat back exhaust system.
I realize I will probably have to use a 2.5" exhaust. Summit has a kit for a great price.
The exhaust shop here in town wants $600 to build an exhaust. I'm pretty sure that's insane.
I also need to know which 2.5" or 3" cat convertor to get...
I'll install the exhaust myself and just have a y-pipe installed.

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Unread 11-24-2011, 07:38 PM   #2
czjeeper
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Found one!
http://afepower.com/shop/details_new...0L&&brandID=63
AFE makes a 3" cat back.
Think I'll do this w/a 3" cat.
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Unread 11-25-2011, 10:14 AM   #3
hesserdude07
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i have 2.5" on my 350... Block hugger short heaers runs into a y pipe, single HO cat and then a flowmaster muffler. Shop did mine from headers back for $475.
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Unread 11-25-2011, 10:25 AM   #4
mike_breaker_5
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3" may be a little big. i run a true dual 2.5" on my 5.2 yj and it flows everything it can plus some. your mufflers will tell the tale over the size of the pipe. i realize your running a single dump. there may be no detriment but i don't believe you will gain any performance from the 3", like i said my .02 is choose a quality performance muffler and keep the pipes at 2.5".

as hesser said... i had the headers, cat, and mufflers already in place, had the shop build me a set of tail pipes, and i walked away with less than a $200 bill to make tailpipes, hangars, and mounts.
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Unread 11-25-2011, 11:25 AM   #5
Doch80
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When I had a 5.2 in my dakota, most guys would keep the 2.5" to the muffler and go to 3" from t back he muffler... especially with headers. The theory is back pressure... 3" would be too free flowing and wouldn't have enough back pressure. That's what I did anyways and it worked and sounded great.
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Unread 11-25-2011, 11:37 AM   #6
5.7YJ
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I had a shop install 2.5" pipes from the headers into a y pipe, then 3" single pipe out the back for $350 including a 2 chamber Flowmaster. Flows and sounds great.
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Unread 11-25-2011, 12:01 PM   #7
czjeeper
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I ordered the AFE kit.
http://www.4wheelparts.com/Performan...pn=AFE49-46204
4 Wheel Parts has it on sale right now w/free in store pick-up.
Now I just need to figure out which cat to get.
What do you guys think about http://www.jegs.com/i/Magnaflow/642/...oductId=750982 this cat?
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Unread 11-25-2011, 03:54 PM   #8
panaceabeachbum
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I went with 2x 2.5" into a y at the rear of transfer case then a single 3" out the back for my 5.3
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