I like the straight up 93oct. Never thought about meth for my car. My hopes were to make it fast enough to keep me happy without ethanol or meth. For now I'm there but I am moving soon and if there is more e85 stations around me, that could change.
As far as tune. My good friend has been using jb4 for along time and always complained about it, now he has recently pulled it out of his car. When i got my car he told me to go straight to mhd and not touch a jb4. I listened so i really know nothing about it.
If i was in your shoes I'd settle the turbos first, then get a custom tune for them, then worry about meth or eth, down the road. See how you like 93 oct on upgraded turbos first. It only cost $100 add on for another map through most tuners after you pay for the 93 map and do lots of logs.
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