http://www.nscra.com/true-street/Rules
Race Format: Quick 16 field, Pro ladder, Heads-up, (.400) Pro tree, No breakout. 1/4 mile Drag Racing.
General: All vehicles and Drivers must comply with NHRA / IHRA / NSCRA safety rules and regulations. Engine catch pan or diaper is not required, but recommended. Chassis certification and Driver licensing must be completed prior to event. NSCRA rules are subject to change based on the National Sport Compact Racing Association's commitment and dedication to competitive racing for every enthusiast.
Body: Import or domestic compact car bodies allowed. Doors must open and close from inside and outside the vehicle. Lightweight components are limited to hood, front fenders, decklid, hatches, sunroofs, wings, ground effects, and bumpers only. Roof, Quarter panels, and doors must remain steel. Widened front fenders are permitted on FWD cars for remainder of 2010 season (widened front fenders will not be allowed in 2011). One-piece front ends are not permitted. No body parts may be removed during competition.
Chassis: All cars must retain complete stock chassis, floorboard, firewall, and frame rails. Notching of chassis for clearance is permitted.
Suspension: All cars must utilize stock front and rear suspension and mounts (ladder bars and four links are prohibited). Wheelie bars are prohibited on all cars. Aftermarket front and rear control arms, struts, shocks, and sub-frame connectors are permitted.
Street Equipment: Headlights and brake lights are required (one headlight may be removed for induction).
Windows: All windows must be OEM glass. All windows must be functional, and roll up and down.
Interior: Stock dashboard and full interior from front seats forward is required (both front seats are required). Aftermarket seats, gauges, and interior are permitted. Dashboard must be OEM stock (vents, clusters, radio, etc may be removed but drivers encouraged to use block-off panels in their place).
Exhaust: Muffler(s) are required. Exhaust must exit underneath the car.
Electronics: Two-steps, data loggers, aftermarket ECUs, and engine management systems are allowed.
Driveline: Open to FWD, RWD, and AWD cars. IRS conversions to straight axle are prohibited.
Transmission: Automatic transmission must be of same manufacturer as engine used in vehicle with OEM case (aftermarket internals are permitted). Trans-brakes are prohibited. FWD and AWD cars with manual transmission must be clutch assisted and utilize OEM case only (aftermarket internals are permitted). RWD cars with manual transmission may utilize OEM transmission or a non-sequential, H-pattern aftermarket transmission (weight penalty for aftermarket transmission, see below). Sequential transmissions are prohibited. Aftermarket bell housings, axles, gears, spools, and differentials are permitted.
Clutch / Shifter: The use of slider, adjustable, or any Slipper style clutch prohibited. Two discs maximum. Clutch must be manually operated by drivers foot. Shifter must be H-pattern. Strain gauges are not permitted. Air shifters and electric shifters are prohibited.
Engine: Only OEM 4-cylinder, 6-cylinder, and 2-rotor engines are permitted. Any internal engine modifications are permitted. Engine must be of automotive import origin or offered as OEM in compact cars sold in North America. Motor swaps of same manufacturer or different manufacturers are allowed as long as they meet weight requirements. Aftermarket blocks are prohibited.
Induction: Any style intake is permitted. EFI or carburetors are permitted.
Power Adders: Turbochargers, Superchargers, or Nitrous Oxide Systems is permitted (only one power adder is permitted). Turbochargers are measured at the inducer wheel diameter at the point where the leading edge of the compressor wheel meets the inlet housing. If nitrous oxide is not permitted for your combination, then nitrous bottles and solenoids must be removed from car and nitrous nozzles must be capped.
Intercooling: Air intercoolers only are permitted. Water injection is permitted. Methanol injection is prohibited. REVISED 2-5-10
Fuel: Gasoline and E-85 permitted, Alcohol is prohibited. Aftermarket fuel cells are permitted, but must be mounted in rear of vehicle. REVISED 1-26-10
Tires: All tires are checked by sidewall designation
FWD cars: Maximum size slick or bias ply tire is 24.5 x 9.5 or any size DOT radial tire is permitted.
RWD cars: Maximum size slick or bias ply tire is 26.0 x 11.5 or any size DOT radial tire is permitted.
AWD cars: Slicks or bias ply tires are prohibited, DOT Radial tires on wheels 17 inch or smaller must be in a 225, 235, or 245 series tire. DOT Radial tires on wheels 18 inch or larger may be any series tire. REVISED 2-11-10
Minimum Weights: All minimum weights include the driver. REVISED 1-26-10
my car's exhaust exits at the back. 
