i put on my RRM testpipe about a week ago and so far i'm really likeing it...i like the feel of the responce and how it feels going up the hils where i live...now my question for those who have the testpipe is...
did your mpg go down much after the install??
i know it would a bit but just courious on how much

 

...after test pipe/exhaust install....
def. felt a loss in mpg...
... spends $3 to $4 bucks more on gas
but i don't mine....i liiikeee it...

 

Im glad this question was asked. I ordered mine last week,and was wondering the same thing.

 

On the highway with cruise on, I got 3mpg more than with out the test pipe. In town, I'm having to much fun with the sound and with my springs and my mileage has gone down, but it's not because of the test pipe, it's me flooring it. You should get better gas mileage since your car doesn't have to work as hard to force the exhaust out.

 

I was thinking just what EvoDreamer said. I'm wondering if that MPG drop is due more to a tendancy to visit redline, or to set up shop in that peak sound RPM range. It's kinda like people with CAIs or SRIs saying they get worse MPG.