Thread: H3 Engine Performance Up-grades
View Single Post
  #18  
Old 09-23-2009, 02:34 AM
TANDREW's Avatar
TANDREW TANDREW is offline
Hummer Veteran
  
Join Date: Dec 2005
Location: NORTHRIDGE, CA
Posts: 62
TANDREW is off the scale
Default Re: H3 Engine Performance Up-grades
I have an auto trans did not see any improvement on gas 13 city 16 hwy, borla catback, 33 in tires. But from a stop when you step on the gas it moves. Great improvement on power all around not sure on HP gains but there is a differance. Had the Borla first better sound not that much more on power. Added PCM big improvement. I'd recomend for the money best improvement you can get. You'll be happy i sure was.
Reply With Quote