I totally agree with Thumper on his first point. You need BOV. However, I'm running a 2G Eclipse BOV vented to the atmosphere and the car runs fine. The RPM's don't go below idle speed even after running hard and coming to a stop. There is of course some richness associated with this, but take it from someone who is running it this way, it's played up to be more of an issue than it is in reality. Oh btw, the 2G bov is a poorly made piece of equipment, like someone mentioned earlier. It doesn't seal properly under vacuum.
Viola, I don't know if the 2G fits into your category of horrific sounding BOVs, but as a matter of opinion I think mine sounds pretty good if you're not looking for something to make a high pitched attention grabbing shriek every time you let off the gas. In any case, I'm going to be replacing mine with something else when I do my IC install, and I'm thinking I'll have a hard time finding a better quality BOV that isn't obnoxious.