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Old 03-05-2012, 07:11 AM
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Performance Exhaust

I am looking into getting a performance exhaust, I am just getting started in my research and I am trying to figure out my best option. Should I plan to eliminate the cat and/or muffler. If so what is the repercussions of doing this. I am looking for a few extra horsepower and mpg. I am planning on dropping to a 3.55 or 3.73 gear so I want to make up for the drop in low end acceleration. Also, any advice in brands?
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Old 03-05-2012, 09:17 AM
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3" downpipe 4" or 5" exhaust with aero turbine muffler
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Old 03-05-2012, 12:44 PM
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I have no cat and no muffler on otherwise stock exhaust. Cutting out the muffler made it sound so much better. Soon here I will be doing a 3" DP with a 4" straight pipe probably exiting before the rear wheel. No cats or mufflers needed.
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Old 03-06-2012, 01:00 PM
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i have a 3" dp 5" exhaust with no cat no muffler, sounds awesome
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Old 03-12-2012, 04:45 AM
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Put the 3" downpipe in it at least. Then the rest is up to you
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Old 03-12-2012, 08:28 AM
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Quote:
Originally Posted by whistlin dixie View Post
i have a 3" dp 5" exhaust with no cat no muffler, sounds awesome
How much more noise do you hear inside?
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Old 03-12-2012, 01:27 PM
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i took my cat out and i cant hear a difference inside at all, but outside all my neighbors give me props on how it sounds so much better, and i picked up some more scoot while getting on it, next i plan to do a full exhaust and delete the muffler too, imho they have a bit more of a whistle out the tail pipe and a little throatier than stock
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Old 03-13-2012, 04:09 AM
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I have no cat but was wondering if I took the muffler off what sound change if any there would be,I use my truck to haul a 35' camper, sometimes it takes hours to reach the camp sites in the mountains and the drone if any would drive me nuts.I have a Diamond Eye system now and I noticed it was louder than stock ,I suspect the system has a performance muffler on it .
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Old 03-13-2012, 04:53 AM
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Based on the various exhaust threads I've read on here the best bang for the buck is a 4" turbo-back system. 5" does not appear to buy any more power for most street builds, just more noise for more money. How much noise you can tollerate depends on you, your neighbors, and the local sound laws. I'd think something like this" http://www.jegs.com/i/MBRP/679/S6218AL/10002/-1 would help turbo spool-up, torque, and fuel economy without running affowel of any local ordiences or pi$$ing off the neighbors. You can always replace the muffler with a straight pipe later if it turns out to be too quiet for you.

Last edited by CPDave; 03-13-2012 at 05:00 AM.
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Old 03-13-2012, 05:33 AM
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Like I said I have the Diamond Eye 4" turbo back system w/ muffler only.I just want to know if taking the muffler off causes more drone in the cab.
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