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Old 05-03-2010, 07:38 PM
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What other things could I do to help improve mileage and or power? Would a new exhaust help out? I would like to change the sound and make it deeper and more aggressive. What brands sound good? Should i only replace my muffler or what?

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Old 05-03-2010, 07:45 PM   #2
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As most people will agree, there is not much you can do to increase mileage or power. You can gain some of your power back through regearing though. As far as exhaust, I am running the banks monster cat back and banks headers. I just had the cat back on at first and it made the exhaust a little more noticeable. Eventually my stock header got a huge crack so I replaced it with the headers. This made a huge difference in sound...more than I was expecting. It was much more throaty and deeper...and it is loud if your foot gets in it. So depending on the budget, JUST a muffler will change the sound, and headers will also make a difference.

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Old 05-03-2010, 07:47 PM   #3
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not much can be done to improve gas mileage or power significantly. The only exhaust mods I've had done were required because of interference with the suspension link mods.

but... lowering it and using 28" tires with 13" wheels is one idea. There also was a thread on here a while back with a unique areodynamic bumper/front clip design. I'm not sure of what became of it. Someone will post it

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Old 05-06-2010, 10:41 AM   #4

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Performance chips/computers might be an option for you.
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Old 05-06-2010, 11:00 AM   #5
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I put in a ram air intake which added a little power to my 4 banger. I also put in a Flowmaster muffler. I didn't notice any power out of the muffler but it makes my 4 banger sound great!! Nice deep sound. I haven't tested the mpg but I think it's a little bit better.
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Old 05-08-2010, 01:10 AM   #6
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Originally Posted by ygohome View Post
but... lowering it and using 28" tires with 13" wheels is one idea. There also was a thread on here a while back with a unique areodynamic bumper/front clip design. I'm not sure of what became of it. Someone will post it
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Old 05-08-2010, 03:14 AM   #7
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The only real way to get more power is to dig deep. Bore out the cylinder .060" pr add a new camshaft, larger valves along with gasket matching all mating surfaces and then some. Then there is always the larger throttle body. I had a XJ that I did all that stuff to on the 4.0L engine and it was a completely different beast. Another friend had the same setup without the engine mods and it was a night and day difference. It depends on how much you want to do on your Jeep and how deep your pockets go.
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Old 05-08-2010, 03:57 PM   #8
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Nothing bolt on with a jeep is going to add much power. Maybe a few HP, but nothing you are really going to notice. I have a bank cat back exhaust....its sounds better, but no noticeable gain in power or mpg, so if thats what you are looking for, look elsewhere.
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Old 05-09-2010, 12:57 PM   #9
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I have a Banks Header, Monster Exhaust, and AEM Brute force intake.. I did the intake first followed by the cat back.. It sounded great, but not a real difference in power or MPG. Once I installed the Banks Header, i noticed a significant power increase in the upper RPM range, but that is about it. I wish I would have had access to a dyno to confirm what I think happened throughout the different mods.

In the end; i am out over $1K for all of those mods and if you were to ask me if I would do it all over again, I would probably say no.. My stock header was cracked, so I supposed my arm could be twisted again to do the Banks Header.

I wouldn't do exhaust mods before I did lockers, gears, and axle upgrades as these are the most important. I felt more power when going from 3:73s to 4:56 gears.

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