an ECU tune makes little difference in power on a stock engine, the 5-10%(tops) is barely noticeable, pull your 100lb sub box out and you will get a lot more performance gain. the resistor gets compensated for by your ECU... there is no cheap power!

That I understand, I was more curious in the mpg, will it help that?
ROFLMA how did you know my sub box is 100 lbs

It trys to flood the engine with fuel it don't need. Until the o2 adjusts it to correct this it pumps unburnt fuel out the tailpipe. Honestly do you think this is gonna help or hurt mpg?

Im gonna have to go with....NO Wow Thanks