Why is my truck quiter without the tune?
Guys, I am getting some custom tunes for my SCT X3 today, and read somewhere that I needed to put the truck back to stock before I put in the new tunes, whether that be true or not...whatever. So last night I inputed the stock tunes back into it, and started it and it was much quieter? I had it set on the canned street tune that was in the X3 before, so not really radical, and now on stock the truck as a whole is quieter, can anyone explain to me what that tune changes that makes it soo much louder? Not that I am worried, I am really just curious. Also, it blew out some smoke for about 10 seconds after I started it back in stock mode, what is that about? It was night time, so obviously I couldn't see very well but the smoke appeared white. It has never done that with the tune in??