i have taken a 2004 BRP 150 poweread(J150GLSRM) and put it over on a 175 INTRUDER SPITFIRE(E175GLEIS) frame...i used the heads,carbs, and reed assemblys from the 175 powerhead on the 150 powerhead..it took several pan mods...and the shift rod had to be changed..various other things..i have ran it twice...runs awsome on my old slead..65 @ 5300 with a 26 raker...i just dont know what to call it..only differance i could find in the 150/175 was jets in the carbs..so what is it...