Can one make use of a mod like the GT640 kit if they are stuck with 92 octane fuel? Here in Washington state (I just moved here from Eastern Canada where we had 94) I have not found anything with more than 92?

Thanks.

 

Seth there are files for that kit for 91 octane and so yes you can absolutely make good use of it. I'd say in some ways much "safer" use from it. You want to pull back a little since on the 640 kit you're still using the stock fuel system.

 

92 is better than 91 in cali.