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I was told when going from M1-M5 to go 6-8 sizes bigger on the return pill(I run injection also),which would lean it out.They say M5 is oxygenated fuel and takes less fuel than M1.
We will have my engine on the dyno in the next couple of weeks and if nothing happens I plan to do a back-back test M1 vs M5.

I have heard of Big gains,No gains....the dyno will show the gains if they are any to be had.

Lets all share ideas and information and I will try them and post some real Dyno numbers from them,and if I see a advantage to running the M5 on the dyno I will do a back-back test at the track and get some ET slips.




Please do, I am going to try some.