Originally Posted by avol3xo
This may not be considered a performance "mod" but I am obviously a Newb here, I have an N55 E92, just got a JB4 S2 with iso. I have heard of people running a mix of E85 and 93 fuel to get more power. How safe is this on a fully stock engine with just the JB4 and how do you go about getting E85 and determining how much to mix?
To run your JB4 to it's higher potentials, you will need a downpipe. It is recommend to get a chargepipe and front mount, but not needed.
If you're going to run e85, you will need the flexfuel sensor for the JB4 to identify the fuel mix.
All in all, I would not recommend it unless you have the DP + Flexfuel sensor.