I have just installed a diablo sport tuner, cold air intake and a 4 inch exhaust and the thing still runs like it's stock to me. What am I doing wrong????
This is an older thread, you may not receive a response, and could
be reviving an old thread. Please consider creating a new thread.
Chevy and GMC Duramax Diesel Forum
A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more!