Not at 5000 feet But since you probably dont ride there, I am not much help. If you run a stock map, I doubt you will need to run more. You can try the power map, and if the exhaust sounds loady, if that a word, its detonating. Need less timing or more octane. If it was me, I would keep the same fuel, then figure out which map works with it, power, stock, or retarded.

 

Im at 4300 ft.

 

Oh hell then, were even. You dont need 110 to run 13-1, 100 max. But with nitrous I would run it. I run 100 in mine with 12-1 on a 25 shot. I would run straight 91 with my comp no nitrous. You might get away with 100 and a stock map. If you want to run 110 then give her all the timing she can take,no octane worry there. Now if you drop to sea level add octane.

 

do you think the vortex is worth the money?

 

Yes!

 

Yes twice, for both my bikes. Now we just put a big gun on my brothers and it works. For alot less also.