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Old 06-22-2012, 04:22 PM
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So right now mines straight piped from the cat back and I was looking for something a little more deeper and throatier, any recommendations? 98 I6
Old 06-22-2012, 06:39 PM
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Originally Posted by zjjerk
Muffler delete(straightpipe),2.5 piping,2.5 spincat from performance-curve.com,3.5 silver vein angle cut tip.I get compliments all the time,it really isn't that loud and doesn't drove on the interstate.



As far as hitch/shackle issues go,i think i had it pretty bad.I had about an inch between my shackle and hitch and couldn't handle the terrible noise the tailpipe was making.


We went this route.We rerouted it to exit just under the ps quarter panel,like alot of the newer rams.It worked out great and this may be a solution/option for others.





This exactly where i am going to run my exhaust!! Only differnence is I did the cut/fold on my lower quarters, so mine will be about 6-8'' higher. I know that running 3'' wont be a clearance issue, but is 3'' piping too big for a 4.0? I've heard too big of piping can really hurt performance
Old 06-23-2012, 09:18 AM
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Originally Posted by woodfar
Need to know. Will exhaust manifold from 4.0 HO fit my 258?
Need to re post this question as there was no response.
Old 06-23-2012, 09:20 AM
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Originally Posted by woodfar
Need to re post this question as there was no response.
Did you try it?

Last edited by Zack92MJ; 06-24-2012 at 08:59 AM.
Old 06-23-2012, 09:31 AM
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Originally Posted by woodfar
Need to re post this question as there was no response.
What you should do is get ahold of a 4.0 head, intake, and electronics. Like this guy


Then the answer to your question would be yes
Old 06-23-2012, 07:50 PM
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Originally Posted by 91XJMudMan
This exactly where i am going to run my exhaust!! Only differnence is I did the cut/fold on my lower quarters, so mine will be about 6-8'' higher. I know that running 3'' wont be a clearance issue, but is 3'' piping too big for a 4.0? I've heard too big of piping can really hurt performance
He's running 2.5in piping, just the tip is 3.5in. Anything over 2.5in tends to loose torque on the 4.0. It doesn't keep enough back pressure too from what I hear.
Old 06-23-2012, 09:45 PM
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Originally Posted by JWB37
He's running 2.5in piping, just the tip is 3.5in. Anything over 2.5in tends to loose torque on the 4.0. It doesn't keep enough back pressure too from what I hear.
Thats what I was afraid of. I've been told 2.5'' to 3'' is good for a healthy V8, which seems right. But then again why do all these import 4 cylinder cars "upgrade" to 3''-4''? So, now that I'm completely clueless of what the optimum size is for a 4.0 inline 6 lol any more theorys?
Old 06-24-2012, 09:20 PM
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As you get bigger you lose a little torque. My 289 v8 is running dual 2.5 with an x pipe but I'm more worried about horsepower then torque.... I think 2.5 header back is perfect for the 4.0
Old 06-24-2012, 10:10 PM
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Default If it looks like an APN...

I have heard good things about the APN header. I found it on amazon for $160 here
http://www.amazon.com/Automotive-Parts-Network-Exhaust-Manifold/dp/B00566GILI/ref=cm_cr_pr_product_top http://www.amazon.com/Automotive-Parts-Network-Exhaust-Manifold/dp/B00566GILI/ref=cm_cr_pr_product_top

This is a decent price from what I've seen however I was looking on ebay and I found this header

http://www.ebay.com/itm/1991-99-Jeep...ht_2442wt_1163

They both look identical and have similar descriptions, the ebay listing just doesn't say APN. What do yall think?
Old 06-24-2012, 10:12 PM
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what is a drop off
Old 06-25-2012, 10:19 AM
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Originally Posted by Slick761
As you get bigger you lose a little torque. My 289 v8 is running dual 2.5 with an x pipe but I'm more worried about horsepower then torque.... I think 2.5 header back is perfect for the 4.0
Thats what I thought but I wasn't sure. Sounds like I am going to run 2-1/2'' the whole way out
Old 06-25-2012, 07:00 PM
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Does anyone on here have a cherry bomb extreme muffler? I'm wondering if the idle sound is diesely at all. That's the only thing I'm not loving about my straight pipe.
Old 06-25-2012, 09:14 PM
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My buddy has one on his wrangler, I think it sounds like crap lol.
Old 06-26-2012, 07:25 PM
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What do you guys think sounds better; the super 40 or 40 series Flowmaster mufflers on the 4.0L?
Old 06-26-2012, 07:51 PM
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Originally Posted by NorCalJeep
What do you guys think sounds better; the super 40 or 40 series Flowmaster mufflers on the 4.0L?
They're the same, but super 40 sounds cooler


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