[H Bomb]

define best tune?? what are your goals?? most power?? safest?? least warranty problems? do some searches tons of info on here

whatever you do though for the love of God don't let any tune company put there sticker on your ecu if your sending it out etc or when you bring your car to BMW you can kiss your warranty goodbye. don't know if places are still doing that but they were at one point

me personally i love my dinan software. don't have to take my ecu out just drive in get it installed and drive out. it is also in there database so when the idiot dealer flashes it back to stock dinan puts it back in for free for me.