I don't think having a loud exhaust would make too much of a difference..you'll still get someone who hasn't heard you, or seen you.
I had a near miss yesterday..the guy looked, pulled out on me and crapped it when i screeched to a halt beside him..being told he hadn't seen me was worrying..(I was in discovery4 workvan with lights on.)
I'm pretty sure high mileage car/ van drivers will say the same...there is always someone not paying attention.
When I had a curvie years ago, I found the best attention grabber was keeping throttle open, hitting the kill switch then back on..that monstrous backfire was awesome! Didn't care if it damaged the bike back then! (Still don't know if it would have damaged anything)
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