Quote: If it's a race only car that has to only idle and go WOT, you don't really need it (but it can help)........but for anything street driven, IMHO, it's a must-have......
IMO, this sums it up. I have helped a couple of guys improve their et by convincing them to stop chasing perfect A/F data. I'm not aware of anyone improving their et by tuning emulsion jets, but I suspect it is possible.
