What are the specs of the car?
If you're having trouble buying a GT300 car, ask any of the entrants, im sure someone will be able to lend you one I would, but im pretty tied up with multiple trades right now.
Stock:
473hp 1100kg
can only add stiffener bars (20k) and turbos (all 3 levels, tier 3 bringing it to 571hp)
I believe all JGTC are technically considered Super GT, but i could be wrong
(The Cusco GT300 is considered JGTC)
Here is the list of all JGTC cars in GT5
1997
Toyota Castrol TOM'S SUPRA (JGTC) '97
1999
Nissan PENNZOIL Nismo GT-R (JGTC) '99
2000
Lamborghini NOMAD Diablo GT-1 (JGTC) '00
Nissan CALSONIC SKYLINE (JGTC) '00
Honda RAYBRIG NSX (JGTC) '00
Honda ARTA NSX (JGTC) '00
Honda Castrol MUGEN NSX (JGTC) '00
Nissan LOCTITE ZEXEL GT-R (JGTC) '00
Toyota DENSO SARD SUPRA GT (JGTC) '00
Toyota SUPERAUTOBACS APEX MR-S (JGTC) '00
Toyota Castrol TOM'S SUPRA (JGTC) '00
2001
Honda LOCTITE MUGEN NSX (JGTC) '01
Honda Mobil 1 NSX (JGTC) '01
Nissan C-WEST RAZO SILVIA (JGTC) '01
Nissan PENNZOIL ZEXEL GT-R (JGTC) '01
Nissan XANAVI HIROTO GT-R (JGTC) '01
Toyota Castrol TOM'S SUPRA (JGTC) '01
Toyota au CERUMO Supra (JGTC) '01
2003
Honda TAKATA DOME NSX (JGTC) '03
Nissan XANAVI NISMO GT-R (JGTC) '03
Subaru CUSCO SUBARU ADVAN IMPREZA (JGTC) '03
Toyota WEDSSPORT CELICA (JGTC) '03
Toyota WOODONE TOM'S SUPRA (JGTC) '03
Autobacs ARTA Garaiya (JGTC) '03
2004
Nissan MOTUL PITWORK Z (JGTC) '04
RE Amemiya AMEMIYA ASPARADRINK RX7 (JGTC) '04