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Old 07-29-2009, 11:27 AM   #4 (permalink)
nemesis
EcoModding Apprentice
 
Join Date: Jun 2009
Location: stl
Posts: 139

rusty - '00 ford mustang coupe
90 day: 24.31 mpg (US)

cbr929 - '00 honda cbr929 fast
90 day: 39.54 mpg (US)

Porshe - '06 Kawasaki zx10r
90 day: 47.21 mpg (US)

truck - '96 ford ranger
90 day: 26.51 mpg (US)
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Quote:
Originally Posted by chuckm View Post
TANSTAAFL. Remember that your engine would then have to work harder to push exhaust gases out. That would translate into poorer mpgs, if not engine performance problems (exhaust not properly evacuated from the cylinders).
Not necessary, I've lost couple of mpg with free flowing exhaust, which leads me to believe that the exhaust with more back pressure might get better gas mileage, I don't have any proof since I haven't done it personally, but it might work
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