[theflipimage]

okay...

assuming we only have the usual intake, header, no cat, and full exhaust, on our dx engines, when would you actually switch the grade of fuel aside from advancing the timing, adding forced induction, and/or nos?

would i/h/e be enough to even upgrade the fuel used?

 

[xxxdoc]

that kinda funny I say never I personally tuned my d15 to run on 91 .