The colour was kind of an Electric Blue, so could have been Nagaro & the bodyshell along with mouldings & 19" 5 RS6 5 spokes all looked RS6 (flared arches etc), but the Zorst looked akin to an S4 with 2 normal sized circular exits. Even more odd was that from memory, the rear valance appeared to be shaped to fit around circular rather than oval pipes.
The car had a private plate, so no idea on age etc. but were S4 size/shape pipes fitted to very early RS6's or has someone gone to the expense of fitting an RS6 bodyshell, mouldings & wheels to an S4?? Perhaps worse, could they have replaced the exhaust with a smaller variety