I am very impressed with the Go engines so far...the 7 port I am currently testing is performing awesome..... very smooth power, broad powerband and wonderful track manners... It is also as fast as hell if you want it to be...... I am now a Go dealer and will be carrying stock of both engines and parts.. As well I will do extensive dyno testing of different pipes and setups on these engines over the winter..... expect to see alot of Clockwork Go engines running around over the next year !