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Old 07-28-2005, 10:11 PM   #1
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Effect of exhaust mods on gas mileage

So I just bought my 2003 ZX3 used and it has a lot of mods on it. Don't get me wrong, they're great, but I'm wondering how these mods effect the gas mileaage. It's lowered 1.25 inches all around, and I think that should only help mileage. However, it has aftermarket headers, high throughput cat, and aftermarket low pressure muffler. How do these mods effect the mileage? Thanks all!


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Old 07-28-2005, 10:17 PM   #2
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one of my buddies, did exhaust header and cai on his gsr and he said his gas mileage improved after that cause there was less restriction and he was getting much better flow, which makes sense, but most people will probably tell you that you would get worse gas mileage because after you do all of that your foot seems to get heavier.
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Old 07-28-2005, 10:21 PM   #3
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one of my buddies, did exhaust header and cai on his gsr and he said his gas mileage improved after that cause there was less restriction and he was getting much better flow, which makes sense, but most people will probably tell you that you would get worse gas mileage because after you do all of that your foot seems to get heavier.
I agree. If you stay the speed limit on all roads, then you'll get better mileage so yeah.
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Old 07-28-2005, 11:28 PM   #4
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problem with performance parts is that after you install them you foot start to get hevier...
mods have a directly proportional to the weight of the foot, and to the consuption of gas
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Old 07-28-2005, 11:32 PM   #5
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Mine basically stayed the same give or take 2-3 miles and it gets driven hard 80% of the time.
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Old 07-28-2005, 11:45 PM   #6
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Quote:
Originally posted by pio
problem with performance parts is that after you install them you foot start to get hevier...
mods have a directly proportional to the weight of the foot, and to the consuption of gas
That is EXACTELY what I was gonna say! I knew Pio was a genius!
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Old 07-29-2005, 08:29 AM   #7
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Ha! Well at least I have the advantage that I never drove the car without the mods. Problem is my previous vehicle was an OLD Ford Ranger, so I'm always loving the 150 hp I have in this little car now. Darn lead feet.
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Old 07-29-2005, 10:22 AM   #8
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what else do you have besides an exhaust to get the power up to 150?
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Old 07-29-2005, 10:32 AM   #9
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Quote:
Originally posted by Nitrozx3
what else do you have besides an exhaust to get the power up to 150?
"However, it has aftermarket headers, high throughput cat, and aftermarket low pressure muffler"

thats what he said he have...

so..
he is not where neer 150
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Old 07-29-2005, 10:47 AM   #10
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Not quites sure what you were saying pio, ive just never heard of a true 20hp gain from a full exhaust, if it is one... it sounds like its just parts of a full exhaust
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