That Redmax that Dan built was supposedly a real runner, if I recall. Since I don't race, I really don't know which would be faster..but Ed built me both a 346 and 5100S Dolmar.....I haven't really run them against each other in a critical test, but would say that they are darned close. (The times that Ed posted when he was testing them showed the Dolmar faster) In other words, the 346 is the better saw, considering it gives up about 5 cc's to the 5100. But, if you decide to build a Dolmar, I have a pipe for it that I might want to sell. Got it for fun anyhow....