My hole point is, how much are you going to spend up front to save some fuel.
If the OP has a car with a header and a large exhaust, but doesn't have the stiock parts to put back on, he has a couple choices:
Drive it as is and see how well he can do with no investment
Try to barter his aftermarket parts for stock replacements, and deal with his car being non-drivable during the removal/shipping/install times (if he can find them local, remove the shipping time from the equation)
Cough up some cash for OEM Honda parts and put them on... then he can figure out how much fuel he needs to start saving before he actually breaks even and starts actually saving money...
I run a header on my truck ($180 for an aftermarket Pacesetter 4-1 header, or $380 for an OEM replacement cast iron manifold (the original unit cracked between cylinders 2/3)..
The header alone is a 50% weight savings over the stock unit...
I'll bet he can get close to stock mileage by adjusting his right foot
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