billy bob , its sounds like a plan , i have an AR ARCS system on mine , you only 20 minutes away from me so give us a shout this weekend if you want to look.
Godzilla has a point as far as "If you've got the money" get an Arrow or an Akra , as a cheap alternative and for the same power output , theres no difference.
As for the noise , I can honestly say I haven't heard a better sounding beemer than mine , I am running a rather strange map on my PCV thats got quite a few minus parameters , but after a few dyno runs and much fucking about with baffles I get the same power levels as the more expensive systems.
I do have a spare GP Ultimate can from AR which is so fucking loud , baffle or not