Most forms of bridge porting is more extreme than a peripheral port. Bridgeys usually have a lot more port timing than a P-port because of the lack of available port area. The best bridge port as far as streetable while maintaining good power is concerned would be a J-bridge with delayed intake port opening and early closing. Delayed and early relative to normal bridgeys, that is.
That said, my peripheral port (damn that sounds so nice to say
) won't idle down below 1400, but that's probably a combination of engine not broken in fully yet, strange intake manifold, and carb waaaay too large.
By "idle" I mean you can leave it there without tending it. It *will* idle down at about 600-700rpm (!) but after about six or seven seconds it will just sorta decide to stop running, unless you tap the throttle to keep things going. I bet fuel injection could fix that.
It's not any louder than the stockport. Then again, I didn't make the exhaust ports open earlier than stock, which seems to be the "volume control".