I'm in the market of purchasing another .21 engine for my K2.
I had a C5 with a TOP 0886 pipe. I also tried it with a Whaller Adapter to see how my bottom end would improve.
I cracked the crankcase when installing a new front bearing
I was very pleased with it's top end, but was not very impressed with it's bottom end -- even with the use of the whaller adapter and the 086 pipe.
Has anyone tried the C5 with an 063 pipe?
How about the WS7II.....how does it perfom overall and what pipe combo impressed you or reccomend