The engine I have w/o the optional Turbo head button spins 34,000,,,with turbo button it spins almost 37,000 and has an 8 port sleeve...The .32rr spins past 37,000 and has a 6 port sleeve..They didnt have that engine when I bought mine so Im thinking the Greenheaded Axial will now go in my OFNA GTP On-road car converted to on/off road and the .32rr will go into the MGT...