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Do aftermarket headers and exhaust systems really improve fuel economy?

19K views 58 replies 31 participants last post by  CB3 
#1 ·
Do aftermarket headers and exhaust systems really improve fuel economy?

I've heard so from a few local guys. They say aftermarket header, exhaust system, and a new chip and the fuel economy goes up. Any truth to that?
 
#56 ·
I do have to say the tornado is a Joke!!! :teehee: I bought it and it was a waste of money... I bought a 1998 Jeep TJ 4 banger and it was only getting 15mpg with 235x75x15 tires and I put a $20 K&N filter on it bought a Magnaflow high-flow cat for $65 and $25 Dynomax Super FLo muffler on sale. All for $95...
That is not that much money for my power back and better mpg.
I just checked my mileage and I got 377 miles off 15 gallons.
 
#59 ·
Though I would like to ask, are there any high performance cat back systems that are as quiet as stock?

How about aftermarket mufflers that are higher clearance than stock and just as quiet as stock?

I like the better ground clearance my aftermarket Hush Power muffler offers, but I hate the noise, and I suspect it might be losing me a bit of mid-rpm torque.
 
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