And to add to Bib's post about what to watch for: I had to take several of the fairings off for the exhaust sys. mods. The bolt on the lower left fairing that goes into the oil sump was badly cross-threaded but I was able to clean up the hole with a tap. One of the upper fairing allen head screws was forced so hard trying to align it with the hole that the screw was bent. One of the captive nut clips was broken. The fairing are fragile and be very careful of the tabs that insert into the adjacent fairing. I didn't break any as I'd seen several posts here about it. Somebody on that assembly line was in way too much of a hurry when the fairings on my machine were installed.
And to hijack the thread, the Mistral muffler without the db killer installed is not objectionably loud, but the backfiring on decel. is. That is bad loud. I know that on some GM ECU's, the injectors are shutoff with the throttle closed. On a '92 Olds Cutlass I had, the reasoning was that with the torque converter clutch engaged, this would help with engine braking. Could this not be done with the Marelli ECU? Say, after a half second of closed throttle, the ECU shuts off the injectors? It would have to decrease the backfiring. Or would it make the engine operation too jerky upon re-opening the throttle? Just a thought, and any opinions from the more knowledgeable would be welcome.