Does installing a testpipe increase or decrease gas mileage? i've heard it decreases because it causes the extra fuel to be thrown into the engine but it also allows for better flow freeing up power sooo... anyone have any insights? thanks

 

more flow might lean out a little, thats why u gain a little power. and i been running a test pipe for 40k miles and i still get over 300 miles on a tank.

 

^ same here. If there is a difference its minimal.

 

You must drive like my mother.

 

300 miles to the tank, either granny driving or a lot of highway miles

 

when I had a berk test pipe, my mileage didn't change.

 

didnt change mine, but damn.. black dust everywhere and smelly.

 

mine went down, i have a tp and invidia, so that might of leaned it out a lot i don't know, but it went down noticeably. Or maybe because i can't keep out of vtec i dont know.

 

300+ miles per tank...how so, I get 240 to the tank and thats shifting at 4k

you will see more black smoke and the rear of the car gets dirty as hell. I hat eit but it pays to play