ORIGINAL: Nik.
GO are make- beleive Novarossi's. They are not as fast or as nice but they are OK for the price.
I would stay away from STS. I had a modded .21T. it was OK, if anything it had a stable idle. Hard to tune. Crank pin broke.
Someone is a nova fanboy
Nobody ever said the Go techs were novarossi's just some people compare them to them in performance. Personally I wont pay $400 for an engine that has hardly anything over my Go tech for half the price. That and Go tech are great about replacing things that may go wrong.