Suprised no one mentioned Razor 8 by allmax nutrition. It crushed everything i've taken. No hitting a wall, consistent energy and focus, and no shaking. Try it if you have never...Can guarentee you'll love it.
2010 E92 TiAg 335 x-drive / Xenon's / Premium Package / Sport Package / M-Sport Package / OEM Spoiler / Hardwired V1 / Lux H8v3 / JB4 PnP /Injen Intake / AMS FMIC / Stett Chargepipe / Synchronic BOV / Custon Tuning / KW1 Coilovers / 12mm Spacers Square / Carbon Fiber wrapped side reflectors