Whoa- yea, you are right- I thought you had installed the long tuned jobs.

Now that I understand correctly, I am surprised to hear about your issues. What you describe sounded to me more like what I hear from guys using the very long "baseball bat" types. I hope I don't have the same issues with the MTWs. If I do, I'll have a set for sale!

FWIW, my understanding with the MTWs was that the header length was 12 1/2". Perhaps the KS are different- but as Dick describes, lengthening them would probably help your situation.

It's probably a real PITA but if you were to mount the engine on a stand and experimented with header lengths you might be able to figure it out more easily- rather than mucking up your plane.

Dave

PS- I had the pleasure of meeting you down at Bealton a few years back- I was hanging out with Elton and Rob Sarlan and you and your brother (no Matt) came down for the weekend.