Originally Posted by busta7777
was thinking of stacking up a jb4 g5 on top of my pro tune e40 wat do u think?
If you're gonna spend more money on mods, just go get your ProTune readjusted for the new mods. It's unnecessary (and you won't maximize the potential gains) if you were to stack the JB4 on your custom made COBB map.
At those levels it's a matter of time until the trans starts slipping (non-MT/upgraded trans problems)