Regal gsx? Never heard of it. Thought it was entirely two separate cars. One was a package, the other a car in inself. Thought the gsx was a package for a skylark or something in the late 60's.
They started the GSX option in 03, you could have it installed at SLP or a shop that carried the upgrade kits. There are some running around that were done at shops.
oh, its an aftermarket car. thats why i havent heard of it. its cuz it never officially existed. its just another calloway, amg, saleen, ac schnitzer etc etc. its just an upgrade from some outside company. well hell, i could do all that fancy stuff myself for a third of the price. anything slp touches, costs an arm and a leg.
yeah they were sold at dealerships however the added parts and performance was done by SLP. Same with the GTX Grand Prix. Saw a very clean one at nationals this year in the car show....the only thing i didnt like was the wheels. other than that they were nice looking cars..