I just flashed my gp1800 stage 1… 8300RPMs… on the riva site it says to go with the 13/20 solas impeller… Iv read online some people say 13/18 may be better… riva only says use the 13/18 for higher mods! Not sure which route to go! 13/20 solas still has great reviews!
Hey PJ! What other mods are you looking at? Will you be doing anything else?
That’s what I’m running at sea level 13-20 , I’m 230 lbs clocking 85 with a fizzle intercooler on a avg 85 degree day , the other impeller is for higher elevations.