Can't nistune manipulate closed loop? From what I've been reading and what tuners have been telling me, It will work a lot better than a piggy. Should see 50-100k's more per tank.Just found out it can't manipulate closed loop, but you can turn it off and set your own parameters. Probably not the best idea to mess with that though.
So when they talk about getting more k's out of the fuel, they must mean while on boost which an auto is always on boost. So a piggy isn't such a bad idea. Until it starts to break down.
What would you pick Scotty?