you won't make much more power using meth if you are already using e85. the only benefit will be the cooler temps. IMO, just get a fmic and stick with e85.
Current: 2011 Honda Accord.
Past: 2013 335i 6mt msport
JB4, ER Downpipe, ATM FMIC, aFe Momentum PRO 5R Intake, Pure Stage 2
Past: 2011 335i coupe 369 whp/444 torque