I drive a Roadster 313 HR and went for a Scorpion exhaust, just the right amount off noise for me. As others have said nice (ish) day roof down and turn the sounds off and listen to that noise from the exhaust as you accelerate through the gears.
The heating system and heated seats mean you get get the roof down on Autumn days and still enjoy it.
Theres also the pose factor Sitting at the lights on a hot day and operte the roof down, it looks the bollox.