I have the twinmax. This sounds like a good winter project... still a little spooked by the ECU business, I have done carb sync, and many many vale adjustments, but never got into the weird science of ECU's.
Where can i find the Guzzidiag?
Guzzi people are so cool, I called an outfit to buy some exhaust gaskets, the cross pipe is loose and rattling. I spent 30 minutes on the phone with the parts guy, he was very knowledgeable. He finally says "have you tried tightening the clamps on the midpipe?" I says Nope. So he says well try that first. Wow a Jap bike parts guy would have been glad to sell me an entire exhaust system to fix the problem.
I came home and checked the clamps... yup they were loose. Problem solved !