All i can say is yes it is must. I have a ESS Akra tune. My car was at the dealer this week and my tune got overwritten with an update from the dealer. The car is total different and lacking power and smoothness that it had with the tune.
I got to get off the internet and fire up the direct flash unit so i can get my tune back..
You guys without the tune dont know what your missing...
2011 E92 M3 | JEREZ BLACK | EXTENDED BAMBOO NOVILLO | EXECUTIVE PKG | M-DRIVE | EDC | M-DCT
MODS | KW S/O | HRE P40SC | Akra Evo |ESS Akra Tune | BMC drop in | StopTech Trophies | TMS Pulley | LUX V3