Just some pics from an ebay listing, but it's a bit of a shame this kit is the end of the line for the 1/25 MPC Pontiac Grand Prix tooling. Not sure if this could ever be backdated to the last stock type issue or not, but I doubt it.
Looking back at MPC's 1970 Grand Prix, the faux front fender exiting exhaust was already present, as an optional feature:
The Grand Superfly's successor, the Sweat Hogs 'Dream Machine' modified reissue from 1976: