[skidlids]

I'm with Paul, its hard to beat an Akro system, not that I have a 848 to run one on, buit always had full Akros on my CBR6s and CBR9s that I raced with North Glos.
I would also recommend Arrow and LeoVince exhausts, always good quality and always look good.
I would look at getting either a Bazzaz or a Power Commander 5 (PC-V) or a Rapidshare for getting the bike set up to get the best from any exhaust change