Assuming 899cc's the Cinq is a bit lighter , 30kg IIRC than the Sei, so all things equal, The Cinq should be a bit faster, as there's less mass to accelerate.
Tom (AofB)
95 Cinq Sporting - Rattly GrpN Catback Exhaust, <font color="black">Buckets</font id="black"> and 3pt Harnesses, 10" Sub and 6x9's.
1242cc Engine to go in soon, boot delock soon, ETech Wing still in garage, so's the effing K+N!