2013 Golf R
 

Hey guys! Just purchased HFS-4 from howerton engineering, and Jeff has been awesome with answering my questions so far. Im completely new to WI so I have a few questions.
1st: I currently run APR's stage 2 tune, am I ok to hook the system up? Does it self adjust, or is there any "safe" settings I should opt for until Jeff at UM custom tunes around the watermist?
2nd: Any one else on this forum run WI on their Golf R's? I'd like to know your personal "lessons learned".
3rd: Is a 50/50 mix ok running a 91 octane Map (with 91 fuel)? I eventually will be getting tuned on a higher octane Map with the system.

Thanks for all of the help.