Stock FT NTC3 pipe. I have read other places where the pipe has been deemed to be an issue, but if it was ok with other engines (they varied a little from full tank to empty tank, but never ran this hot!), then I don't want to be chasing my tail. I'm going to install the Novarossi engine tonight and see how that goes.

After that I'll see if I can still be bothered with the STS.