i think it would be easier to find the 944 cup bbs and ask there... i'm sure they not only know all the tricks but will probably point you to a "community" stock exhaust complete w/ 4 in-line cats
if not, then sneak around w/ the plate off your targa since most of the driving will be to and from the track...
how about pelican's 944/924 board?:
http://forums.pelicanparts.com/forum...amp;forumid=10
edit: this is funnY
http://forums.pelicanparts.com/showt...hreadid=223182