SCCA - Javelins run GT-1 class against...
...Concords & Spirits, Buick Regals, Berettas, 67+ Camaros, 63-97 Vettes, 90+ Luminas, 95 Montes, Monzas, Daytona/Avenger/Laser, 65-70 & 79-00 Mustangs, Probes, 83+T-Birds, Mazda RX-7, Capri V-8, Nissan 300ZX, Aurora, Cutlass Ciera 87+, Toronado 87+, Panoz GTS, Fiero, Firebird, TransAm, Grand Prix, Porsche 911 & Boxter, & Shelby Cobra.
GT-1 is the fastest of the Grand Touring classes.
"GT cars are purpose-built, highly modified replicas of series-produced sports sedans. GT cars are permitted tube-frame chassis with performance being equalized by allowing cars with smaller engines to compete at a lighter weight. GT-1 cars are the fastest of the category and are the closest to the SCCA Pro Racing Trans-Am® Series. Several of the current front running cars in GT-1 are last year's Trans-Am cars and many of these GT-1 drivers compete in selected Trans-Am events throughout the season. GT-2 through GT-5 cars get progressively lighter and less powerful. Cars include Toyota Celicas, Mazda RX-7s, Nissan 200SX, Honda CRXs and Austin Mini Coopers, just to name a few."
What makes/models are eligible for GT? See the searchable database.
http://toyota.shults.com/cgi-bin/scca/scca.cgi
