Hey Steamer! I have the tapered SE slip ons fitted to my '08 sporty - (got them a while ago though). They are the same as the stock design and are called Screamin Eagle Slip-fit Pro Torque Mufflers (P/No for sporty - 80051-00) They are used with the standard crossover pipe (to maintain low down power). I am not sure if they will fit the current sporties though!!! I had to use spacers between the muffler and the mounting bracket to fit them - no big deal, just a bit of the old noodle work!!
Here is a link to the PDF info: www.horsepowerhd.com/pdf/seproparts04_3.pdf
RedNed
Ive got the Screamin Eagle pipes.. Theyre ok, add a nice note but not obnoxiously loud.. If you ask the the guys at Peter Stevens nicely you can get them (well I did 6 months ago) for $360 odd.
Extra performance? dunno.. sound better? yes, look better? I think so (but I went with the shorty side slash).
They look sort of stockish (which I like), but still a little different, they are borderline road legal (theyre NOT, but you're not as likely to get pinged as something obnoxious like some of the V&H stuff).
i was going through the same delema not long ago.....turbo tappers or straight shots. found a new set of straight shots for $250.00 landed to Rocky so i went with that. i found the standard baffles too loud (even when riding) so purchased the quiet baffles (didnt like the sound) so took the matting off them and now i like them.....yes they are still on the loud side.