For Evo's, I have a 99 FXSTC.

Just wondering what f any additives people have used and what
success ou've had.

Things like,
gas line carb. cleaners (I've heard today's gases are more yucky)
gas performance boost, to get a little extra HP.


Same for oil additives ?

I try to put some fuel injection cleaner in my gas tank every oil change :confused: if I remember. I've used octane boosters periodically but consider them too much of a hassle to carry with me. If the pinging gets too bad :eek: I retard the timing some more if I've remembered to bring the ignition programmer with me.