1991 Jeep Wrangler Exhaust Advice? - Page 2 - JeepForum.com

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post #16 of 26 Old 05-18-2010, 10:59 PM
JPRatYJ
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1990 YJ Wrangler 
 
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Location: Kennesaw Georgia
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Quote:
Originally Posted by MoparFreak69 View Post
The cat doesnt really do much for the sound of an exhaust. It will tone it down ever so slightly just because of its design, but it by no means acts as a muffler. Deleting it will not change the sound. A good cat does nothing to affect the performance of a rig and at the same time is better for the environment. If its not plugged why toss it? I am not a tree hugging hippy by any means but the least we can do is make the least impact on the environment as possible right? A cat simply uses heat and ceramic to convert carbon monoxide (poisonous) to carbon dioxide (what we do when we exhale). Leave the cat on if its good and just find a nice sounding muffler and be done with it.
As far as recommendations on muffler? Its all about personal preference really. When I had my quad everybody was trying to get me to buy a Yoshimura exhaust for it. I didnt like the tone and ended up going with a Pro Circuit. Just because the recommendation is what everybody likes doesnt mean you are going to like it as well.
my jeep was straight piped from the header to a flowmaster when i got it and a cat made it 100000000% quieter


/l ,[_____], 1990 YJ 4.2 Weber 34
l---L -[]lllllll[]- 4in Rustys, 3in body, 1.25 Shackles
()_) ()_)--o-)_) 33 Kumo's M/T and smittybilt tube fenders -----Johnny Rat-----
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post #17 of 26 Old 05-19-2010, 07:04 AM
Chris Aunchman
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Yea have to agree cats totally quiet down and exhaust system, been there......especially if they aren't high flow cats.
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post #18 of 26 Old 05-21-2010, 08:16 AM Thread Starter
DanielShearer
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1991 YJ Wrangler 
 
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so basicly just remove the cate... and straight pipe it back to a magnaflow muffler... how much do you think that will all cost?

I know you can buy alum. pipe only for like 10 bucks and the muffler you think will be around 60-80?

sounds like the glasspacks and thrushers would be too loud, so i think ill just go with the magnaflow
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post #19 of 26 Old 05-21-2010, 08:23 AM
Jeeper_YJ
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Magnaflo with cat is loud. Straight pipe to magnaflo is louder. Just depends on what you think too loud is. Remember, not to rain on your parade. Removal of a cat is a federal offence regardless if your state or city doesn't smog check.
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post #20 of 26 Old 05-21-2010, 08:30 AM Thread Starter
DanielShearer
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1991 YJ Wrangler 
 
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Good point... guess ill just leave it on then, not hurting anything apprently... will the magnaflow have a more bellowing sound or "whopping" sound if you know what i mean.

My jeep does have headers put on, idk if that means anything lol
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post #21 of 26 Old 05-21-2010, 08:31 AM
FxORubi
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I would just listen to jeeps in the area for the one you like and ask them what they got on theirs. because honestly you wont notice an improvement with a cat back system its more for sound then anything else. i got an edge chip and bored throttle body with a k&n intake and banks cat-back monster exhaust. on the dyno im making 147hp and 193TQ i did gain a mpg or two, but not much to show for the money! so if i was you get something that sounds good with out spending an arm and a leg on it.
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post #22 of 26 Old 05-21-2010, 08:35 AM
Jeeper_YJ
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Quote:
Originally Posted by DanielShearer View Post
Good point... guess ill just leave it on then, not hurting anything apprently... will the magnaflow have a more bellowing sound or "whopping" sound if you know what i mean.

My jeep does have headers put on, idk if that means anything lol
It's a deep sound. I have Magnaflo on the suburban, Borla on the jeep Borla on the dodge neon. Borla isn't as loud "size for size". Meaning, if your not into loud, make sure you avoid the small Magnaflo case size. I think those are 12-17". Anything bigger 22-27" is quiet. I have the 22" and its above stock. Quiet in the suburban, but I can hear the wife a few houses down coming home. I noticed more remove their loud mufflers than make them louder. Help?
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post #23 of 26 Old 05-21-2010, 08:38 AM Thread Starter
DanielShearer
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Yh I think I like a more bellowing sound so anything 22-27? what type of muffler would that be?
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post #24 of 26 Old 05-21-2010, 08:39 AM
Jeeper_YJ
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Quote:
Originally Posted by DanielShearer View Post
Yh I think I like a more bellowing sound so anything 22-27? what type of muffler would that be?
22"-27" is the body size of the Magnaflo.

www.PerformancePeddler.com has good prices.
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post #25 of 26 Old 05-21-2010, 08:42 AM
JohnFM3
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1992 YJ Wrangler 
 
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I am loving the sound of my High Flow Cat and FlowMaster combination. Factory system to the cat, 2.25 inch into the FlowMaster, and 2.5in Manderal Bent tail pipe.

Has a nice clean mellow idle tone, and a deep tone at higher rpms. Most importantly, I dont have a rasp to the downward side of a Throttle Snap. I can run the rpms up and bring them down and NOT sound like a RICER.

John

John Moore ~ Real Men Still Crawl...
97 XJ (Diablo) 4.0L H.O. w/AW4 4sp Auto Dana 30/Chry 8.75 2.5 inch Flowmaster Exhaust 4 inch Lift w/ 32inch tires & RS5000 Shocks
92 YJ (BOSS) 4.0L H.O. w/AX-15 5sp Manual, 231 TCase, Dana 30/8.8 (3.73) 2.5 inch Flowmaster R.E. 2 inch lift and 2 inch body lift for CJ clip
XJ http://www.cardomain.com/ride/2634588 YJ http://www.cardomain.com/ride/3322306
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post #26 of 26 Old 05-21-2010, 08:42 AM Thread Starter
DanielShearer
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sounds good... so keep the cat on and just get the magnaflo muffler...

thanks for all your help guys
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