Reviewed By Craig R (ONTARIO, CA) Reviewed for a 2004 Chevy Colorado —8/13/2009 11:59 AM
I purchased the stage II performance module for my '04 Colorado, with a current odometer reading at 70,000. I have just the K&N stock replacement air filter, Magnaflow exhaust muffler, and running on 91 octane. I noticed an immediate increase in HP, mainly acceleration. I did not notice a big difference in MPG, though I believe there was an increase. I achieved 24.2 MPG highway running 75MPH constant. Was hoping for better mileage increase, but am satisfied with the extra boost in power!