THE BODY:  Body may not be sanded or otherwise altered to reduce weight.  Car must have an interior.  Interior tray from the standard car may be used; or vacuum formed interior from the Pro Nascar may be used in any car (not just in Pro car).  The roll cage is to remain in the car. Cars must have (original and unmodified) full window glass. The rear wing or spoiler must be there at the start of the race; racers will not be penalized if the wing breaks off during competition.  Body mounting posts (the two posts in the front of the body and the single post in the rear of the body) may not be cut, shortened or otherwise modified in any way.  Side body posts and axle retaining posts may be removed.  See photos below for guidance. 

CHASSIS:  Chassis modifications are allowed for clearance of SCX Pro parts used. Cars may not be lightened by cutting/sanding the chassis or the interior, any modifications done must be for clearance (crown gear clearance or wheel hub clearance) issues only. Enforcement of this rule will be at the discretion of race officials (for both regional qualifying races and for final race). Chassis may be clearanced slightly to allow body to float.  Gluing of motor pod is allowed. Tape may be applied to the chassis to limit motor pod travel. Light sanding may be
done around motor pod to allow pod travel. A Pro SCX motor pod may not be cut into a non-Pro car. A car that came with a two-post pod must retain a two-post pod. A car that came with a 4 post pod must retain a 4 post pod configuration.  The stock screws/hardware can be modified. For example, threads be sanded/filed to improve "float". 

WHEELS/AXLES AND TIRES: All wheels & tires supplied by driver.  Tires shall be Super Tires  #1601 only.  Axle and bushing mounts may not be altered in any way.  No chemical treatment (ie., oil soaking or applying finger nail polish to harden surface of tires) is permitted
on tires. Racers doing so will be disqualified from the event and forfeit their entry fee. Wheels allowed are the SCX standard plastic wheel or the SCX Pro wheels. Any SCX Pro rear wheel is allowed, as long as the Super tires #1601 tire will fit.  Ball bearings are not allowed.  Tires may not project beyond body when car is at rest on level track, viewed from directly above.   Only SCX "Type 052" tires are allowed on the front.   Front tires may be sanded for truing but the full lettering/numbering (which is molded into the stock tire) must be visible on the inside sidewall of the tire. You may not sand into the lettering/numbers (molded letters/numbers - not referring to Tampo printing) on the sidewall. Tampo printing need not be present on sidewall of tire. Applying nail  polish or other substances to harden the tire surface is not allowed.  

GUIDE BLADES/BRAID:  Guide flag may be collared or glued to limit sideways play. Manner of collaring or glueing the guide is up to the racer. Non-SCX parts may be used to do this as long as the stock guide is retained. A Pro guide may not be cut into the Non-Pro chassis.   Braids are allowed to be rewrapped around the guide. Any brand of braid is allowed.  No braid juice allowed.  Racers will be allowed to adjust their own braids during regional race. They will call out to a race marshal who will come to them and watch as they adjust braids or remount tire that might have slipped. 

MOTOR:  Must use Pro Motor RX-4H, part #50650, driver supplied.    Top 3 finishing motors will be tested for RPM.  No modifications to the motors are allowed - racers doing so will be disqualified from the event and forfeit their entry fee.  This includes, but is not limited to the use of ANY type of "comm juice" used specifically on the brushes. So no VooDoo Juice or similar substance is allowed to be used on the motor at all.  Also no 'engine cleaner' or any other chemical is allowed, with the exception that oil or lubricant is allowed on the bearings of the motor.  Wires may be soldered in car to conduct power from motor. Any brand of wires is allowed. If a racer is going to solder in wires that racer is responsible to bring a soldering iron to accomplish this.  Electronics, noise suppressor on the motor/chassis may be removed or may be intact.

GEARING: SCX stock plastic crown gears or Pro crown gears only allowed.  10 tooth pinion that comes standard on the SCX Pro RX-4H motor will be used as the standard pinion for the regional and National finals. The pinion may not be altered in any way.  Grease may be added to gears.

WEIGHT:  Weight may be added, weight minimum for each car is 97 grams. ALL weight must be fully contained inside the body or magnet holder.  Weight must be glued or self-adhesive used to prevent it from coming loose. Weight may NOT be glued/taped in whole or in part under the chassis. Weight must be some type of metal/lead, modeling clay or similar substance is not allowed.