well after recommendations from NJF4, friends, and the guys at my local shop, i bought a Jardine RT-One aluminum slipon for my F4. luckily, the shop just happened to have one in stock - but only the race baffle. oh well, sportbikes arent practical by nature so why should it sound practical?
installing it was easy - it took longer to take the fairing off. the thing is LOUD, but i like it. it's fairly deep but with a raspy edge at high rpm's. on the road, i can definitely feel a difference - the power delivery seems so much more linear, and pulls a little harder.
overall, im very very happy with it. thanks to everyone who responded to my earlier question about slipons