Rules
This section is not an exhaustive set of rules; it is intended to give the reader an idea of the preparation level of the cars in this class.
The ITCS specifies that cars may remove almost all of their interior components, as a safe race car has few flammable features inside and drivers do not want to worry about projectiles from inside their own cars during a race.
For most cars, air induction to the point where the air meets either the carburetor or mass air flow sensor is unrestricted by the rules, so cars may be prepared with improved air intakes. Exhaust systems are also unrestricted, so exhaust systems including headers may be modified. Cars may have to remain under a maximum noise level, so mufflers might still be needed.
Stock brake calipers and rotors must be used, but pad material is unrestricted.
No internal engine modifications are allowed short of rebuilding to factory "blue print" specifications, though the car's ECU may be modified or replaced with an aftermarket unit.
"Bolt-on" suspension modifications are allowed, including most coil-over shock–strut systems. Relocation, reinforcement, or custom fabrication of mounting points is not allowed.
DOT-approved tires are required, so full race tires may not be used. There are however some very high quality "DOT" tires available that perform very well at the track but are not actually intended for street use. Lightweight racing wheels may be used, but the sizes are limited by the rules.
While the ITA, ITB, ITC, ITS and ITR classes allow different model cars in competition, the classes all use the same basic rules. The cars are grouped into the different classes based on their potential for performance. A sampling of popular cars and model years in each class includes:
- ITA: Honda CR-X (1989–1991), Mazda RX-7 (12A engine, 1979–1985), Acura Integra (1.6-liter engine, 1986–1989)
- ITB: BMW 318 (1984–1986)
- ITC: Honda CR-X (1.5-liter engine, 1984–1987)
- ITS: BMW 325 (E30 body, 1987-1991), Mazda RX-7 (13B engine, 1984-1991), Datsun 240Z (1970-1973)
- ITR: BMW 328 (E36 body, 1996-1999), Porsche Boxster (2.5-liter engine, 1997-1999), Nissan 300ZX, Acura Integra Type R, Ford Mustang (V6 or 302), Mazda RX-8, Honda S2000
Read more about this topic: Improved Touring
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By the same laws which first herself ordained.”
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—Leontine Young (20th century)