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Custom Dodge Ram Performance Mods - Engine - 5.9 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!


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Old 05-17-2011, 12:55 AM
bigblack21 bigblack21 is offline
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Default will new exhaust help a lot with power and mpg?

ok so plan on putting a true dual exhaust with not cats on my truck this summer. i am planning on getting long headers and going with a 2.5 or 3 inch pipe. i am also going to put some mufflers with tips to get a little better sound. but will this help with mpg's and power or just power? my truck is getting about 11 mpg which is terrible so i want to do something that will help and also give me more power. i also plan on buying a new air intake too. how much will that help also?
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Old 05-17-2011, 01:25 AM
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Quote:
Originally Posted by bigblack21 View Post
ok so plan on putting a true dual exhaust with not cats on my truck this summer. i am planning on getting long headers and going with a 2.5 or 3 inch pipe. i am also going to put some mufflers with tips to get a little better sound. but will this help with mpg's and power or just power? my truck is getting about 11 mpg which is terrible so i want to do something that will help and also give me more power. i also plan on buying a new air intake too. how much will that help also?
intake will increase your HP and your MPG
and exhaust will help to an extent.
it wont be to noticeable but there will be a small gain ( if you can keep your foot out of it)
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Old 05-17-2011, 01:46 AM
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both the intake and running a better flowing exhaust will help in power and mpg, but not a whole lot. however i would probably either keep your cats, or upgrade to a higherflowing one, incase of emmissions and inspections.
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Old 05-17-2011, 04:57 AM
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Those two combined will cause an increase in power, but i'm not certain it will help mpg's. I don't want to sound like a dick, but if you bought a truck, you shouldn't have been worried about gas mileage. Especially with a 5.9. These motors are terrible on gas and there's really not a whole lot out there to improve it. Mine's averaging about 12.3 with mostly city driving.

As for the exhaust, I wouldn't recommend running no cats. Sure, you can get special things to clear any codes that the O2 sensors will throw, but it still will screw up the air/fuel ratio and won't help your mpg's at all. You'd be better off going with some better flowing cats rather than no cats at all. And I wouldn't run 3" pipe either. These motors have to have some back pressure or you'll lose low end torque. The biggest pipe I'd recommend would be 2.5" at the most. You can run 2.25" and be just fine.
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Old 05-17-2011, 07:45 AM
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JCasey10 is right on the money...... Only thing I will add is to check the TB to see if cleaned and check the plenum to see if it's leaking. Both can cause lost of mgp.
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Old 05-17-2011, 08:32 AM
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it will help performance thats for sure but ull be driving under every overpass and kickin it in neutral just to rev it and listen to the beast roar!!!!!

i average 12.9 mpg between city and highway u can change ur rear end gears to run a lower ratio but that can be pricey. the show xtreme 4x4 took a ram 1500 5.9 4x4 and did an episode on things to do specifically to help with mpg's it was pretty informative.
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Old 05-17-2011, 11:30 AM
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An exhaust by itself probably won't give you much. Now, combine a better intake to an exhaust and you'll most likely start noticing an improvement. I would do these

Throttle body mod-- http://www.ramforumz.com/showthread.php?t=46431

Intake manifold mod-- http://www.ramforumz.com/showthread.php?t=80192

Both of these mods are free and will let you take advantage of the free flowing exhaust system you put on. I think if you do true duals with headers like you planned, open up the throttle body and intake manifold, and put on a cold air intake, you'll feel a much more significant difference than if you did just the exhaust alone. The best part is that you won't even have to spend any more money than you would have. Plus, it gives you a good base for future mods like a cam, rockers, tuner, etc.

I would also agree with those who said to keep the cats. The difference you feel would probably be negligible and having them on could save you a ton of headaches when it's inspection time.
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