and im thinkin of gettin a tuner...
http://www.americanmuscle.com/sct-li...600-tuner.html
this guy claims to give 19-20 hp on my mustang... true or false??

http://www.americanmuscle.com/sct-x3...ash-tuner.html

and that one doesn't say anything but has pretty good ratings... does anyone know what kind of gains that would give to a 2003 v6 auto w/ flowmaster 40s???

TQ?? HP??

 

You won't even come close to seeing 20hp from a tuner. You might get 8-10 if you use the 93 octane tune, but I'd bet you are going to use 87 with these gas prices. The main difference for you would be the firmer shifts since you have an auto. Personally, I can switch between my 87 performance tune and factory stock tune and not even notice any difference with my 5spd.

edit: why are all these damn apostrophes showing up

 

laaaaaaaaaame... any idea on that 87 tune and its gains? it doesn't really give any info on the site