unfortunately where i live, the best gas we get is 91octane. i am currently looking to add mods to my evo and would like to stick with one tuner. the reason for this is that i would like to be able to get advice, programs, etc. from a reliable source. most tuners though offer their products with 93 or 94 octane tested. so far i am looking at Buscher, AMS, Vivid, and RNR. my top choice is the Buscher stage 2 or 3 and eventually 4, but their maps are for 94octane. which company would you recommend in my situation?

 

Dave Buschur tells me that the tune for the S-AFC II for 91-octane is the exact same, except you need to turn the boost itself down a notch.

 

i might also want to check Vishnu. all of their maps and testing is done first on the 91 **** gas. they are from Cali so i am sure they might be able to help you out.

 

otherwise, RNR in san diego tunes for 91-octane, as does works and vishnu, being that they are all from California.