Hi Bill,
Don't you think a sane man would have crapped-out by now?
I'm probably not the right person to ask that question of. [sm=spinnyeyes.gif] I certainly wouldn't have crapped-out by now - curiosity and brainless optimism win out every time...
I have read here where the .09 has a very loud and ratty exhaust note.
I guess I'm about to find out. I just got a nice little tongue muffler (Aero Products AP-9) for my Enya SS15S - turns out it fits the 09-IV as well, so there's another option for you if the tuned pipe thing doesn't work out. I have no idea yet whether it actually reduces noise or just looks good.
All the best with your Hyper Viper project - and yes, the Mercury Marlin is a fantastic-looking thing and I probably need to make one.
Cheers
Steve