Don't buy that completely.. There have been plenty of videos over the years from the States with Go 5-ports and even 3-ports with truggies tearing it up pretty well on US tracks.. Also, the Go thread is long and full of happy US truggy drivers, so maybe not for some tracks, but for most the Go 5-port is a good engine.. It was also a tremendous value in kit form with the spare conrod, two plugs, pipe, venturis, head shims, etc.. People even say the 5-port is too much for buggy - which is what most people say about engines more optimal for truggy. I also ran a Caster Grenade (Go 5-port clone) in an RC8 buggy, and it was probably over-powered for most serious buggy racers... It was also easily the best idling engine I've had... My other Italians so far have been a Nova 528XR, an Orion 24, and a Picco P7 Evo 2.. The Picco was good, but the first two absolutely SUCKED. Oh yeah, also have a Nova 5-port now, and it's good, but not outstounding or anything. I'd take the Go over it..