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Old 09-15-2008, 07:39 AM   #1
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catback = improved mileage?

I'm looking at the MBRP catback in my quest to improve my gas mileage as much as I can. I realize there will be more urge to get on the throttle if the exhaust sounds better but assuming I don't what sort of mileage increase could be expected?


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Old 09-15-2008, 09:04 AM   #2
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your not going to gain much, it is better flowing of course, but as far as mpg gain, maybe 1-2 and if thats the only reason you want it, you can find a much better way to spend $300 on improving your fuel economy
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Old 09-15-2008, 09:08 AM   #3
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youll probably get the same. I got a little worse at first because id give it more gas to hear the sound. Great exhaust though
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Old 09-15-2008, 09:09 AM   #4
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such as?
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Old 09-15-2008, 09:10 AM   #5
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youll probably get the same. I got a little worse at first because id give it more gas to hear the sound. Great exhaust though
I've heard it's not much louder than stock when just driving around normal. Any truth to that or is it loud all the time?
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Old 09-15-2008, 11:59 AM   #6
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Very very little actual gain in efficiency to the engine. If you want a catback exhaust for the noise, do it for that. It'll set you back, what, $400? You'll never make that back in saved fuel economy. If you want to increase your MPGs, exercise good driving manners and self control, and spend the money on keeping your car in a proper state of tune.

You will not, ever, make money by spending money in this way. It's the same logic as taking a $5,000 bath trading down to a car with ~10% better fuel economy - its self deception at best and plain idiocy at worst.
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Old 09-15-2008, 12:25 PM   #7
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Very very little actual gain in efficiency to the engine. If you want a catback exhaust for the noise, do it for that. It'll set you back, what, $400? You'll never make that back in saved fuel economy. If you want to increase your MPGs, exercise good driving manners and self control, and spend the money on keeping your car in a proper state of tune.

You will not, ever, make money by spending money in this way. It's the same logic as taking a $5,000 bath trading down to a car with ~10% better fuel economy - its self deception at best and plain idiocy at worst.
If I was to get one I'd probably wait to see if Santa would bring it that way it doesn't cost me anything. But if it really wouldn't save me that much gas I'd look at other things.
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Old 09-15-2008, 01:07 PM   #8
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You might gain more gas mileage with an intake and throttle body.
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Old 09-24-2008, 10:30 PM   #9
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There are very few mods that will help mpg. The factory squeezes about as much mpg as can be had. Alot of times when you go with a "free flowing exhaust" the scavenging effect is lost and MPG goes down. Only reason to do an exhaust on these cars is if you have a supercharger or you just want it to sound fast.
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Old 09-25-2008, 07:32 PM   #10
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There are very few mods that will help mpg. The factory squeezes about as much mpg as can be had. Alot of times when you go with a "free flowing exhaust" the scavenging effect is lost and MPG goes down. Only reason to do an exhaust on these cars is if you have a supercharger or you just want it to sound fast.
i'd like to know why having a supercharger has anything to do with it? People buy exhausts sor either sound/style/performance. Not b/c they have a supercharger rofl. So are you saying it's a waste to do full exhaust cause all it does it sound fast?
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