http://www.ps3trophies.org/forum/gran-turismo-5/81077-race-series-what-car-use.html

This is the ultimate guide on what car to use in what races.

An example:


Gallardo Trophy LV 17
Cr. 36,600 Cr. 26,000 Cr. 23,000
Entry Requirements:
Cars: Lamborghini Gallardo LP 560-4 '08

Dealership:
Lamborghini Gallardo LP 560-4 '08 - Cr. 253,300
A-Spec: Sports ECU, Engine Stage 1, Racing Air Filter, Catalytic Converter: Sports, Titanium Racing Exhaust, Hard Racing Tyres
B-Spec: Same as above + Soft Sports Tyres. Comfortable win with Class 16/17 driver.


Check it out it isamazing

Awesome this will save A LOT of wasted cash!!