Reviving an old thread for a good question... what about p5's that now have the msp turbo kit? always ran 87 in my 5 and still do now that im boosted no pinging or detonation so far but should i switch to 93?
93 Sunoco runs best i run shell's 93 and i think sunoco's better regular is a no no 91 is ok but 93 all the way i still have my 93 octane warning sticker on my lil gas door whatever u call that