PSI top ends?

[Tubsy]

Has anyone ever tried these?
a tvscene.com/evaluations/psi-425-r.htm

for some reason if i dont put hte space there it bleeps it out lol

[Creech52]

I have heard they build grenade motors. Pretty fast but dont last long. Although they are pretty big in the sled world. To be honest tho, I havent even heard of them in quite some time. Dunno if its cuz I havent really been around the scene, or if they just kinda fizzled in the R world.

[Tubsy]

Yeah same here they said the 330 pumps out 67hp thats crazy