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Post by Nightpath on Apr 19, 2015 10:26:46 GMT -4
I've been looking around at different mufflers for my project, and noticed that the stock XJ muffler has a 2.25" inlet and a 2" outlet. I've been stuck on the train of thought that I want a 2.25" inlet and the same or larger outlet so the exhaust flows smooth.
I'm curious, what is the reason for this? I've done a bit of searching and have my own ideas, but I'd like to hear what others say.
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The Garagemahal
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Build Thread King
Resident Army Ranger , Navy Seal , Super-Warrior , Ninja !!
Posts: 11,518
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Post by The Garagemahal on Apr 19, 2015 13:07:29 GMT -4
It keeps back presure on the engine . Some say it = more power , others say more flow the better
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Post by Nightpath on Apr 19, 2015 17:30:44 GMT -4
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Post by Nightpath on Apr 23, 2015 7:21:48 GMT -4
Anyone have experience running a 2.5 inlet / 2.5 out as opposed to stock 2.25in/2.0" out?
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Post by C Monster on Apr 23, 2015 8:02:52 GMT -4
I'm running one in reverse on my tj, I put a yj muffler on it
but some muffler are reversible and some are not
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Post by Nightpath on Apr 23, 2015 8:29:40 GMT -4
Yeah I know about reversible mufflers, came across a few. I'm debating straying from the stock Inlet 2.25" / Outlet 2" to a larger size. I've seen some people say that the newer mufflers at the stock size flow better, and others saying that 2.5" inlet/outlet is the best.
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Post by C Monster on Apr 23, 2015 8:33:20 GMT -4
ok the one on my jeep is now 2.5" in and 2.25" out
I know it did give me more torque. but I loss some top end power, vs my old 2.5 in and 2.5 out
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Post by Nightpath on Apr 24, 2015 10:48:50 GMT -4
I'm going to get the 2.5"in/2.5" out, run with it. If I want it to be 2.25" out I can get the exhaust tail pipe modified by the muffler to 2.25"
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The Garagemahal
Moderator
Build Thread King
Resident Army Ranger , Navy Seal , Super-Warrior , Ninja !!
Posts: 11,518
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Post by The Garagemahal on Apr 24, 2015 11:54:36 GMT -4
Factory 4.0 IS 2.25 , in & out
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Post by Nightpath on Apr 24, 2015 12:18:09 GMT -4
I've read that the stock muffler on the XJ was restrictive, and aftermarket of the same size have better flow (I guess the tubes inside were too close to the ends).
2.5/2.5 should work fine I think.
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