i have a 2005 gmc sierra 4.8 5 SPEED MANUAL all stock motor with a 70 mm turbo setup 10LBS BOOST and the truck runs pretty damn good i must say but my question is can i add the E85 or meth i guess its called to this setup with no problems or what am i gonna have to change THANKS!!!!!

 

Maybe I read your post wrong but E85 and meth are different. In order to run pump E85, you will have to change the stoich value in the tune. If you buy a methanol injection kit, you will have to retune for the added fuel when in boost.

 

AH OK THANK YOU so which is better??? im guessing the meth kit for hp gains