Import Showdown Race Rules

Everything you need to know about race day.

Competition Rules

All classes are competitive and competition rules are enforced! Please make sure that you read and understand the rules for the class you plan to compete in. If you have any questions please contact us for clarification. Any protests of competitors in your class

MUST BE BROUGHT TO THE ATTENTION OF ISD STAFF BEFORE THE 1ST ROUND OF ELIMINATIONS, NO EXCEPTIONS!

ALL PAYOUTS ARE BASED ON FULL CAR FIELDS

Rules That Apply to All Classes

IF YOU ARE NOT PRESENT, YOU DO NOT RACE! CHECK EVENT SCHEDULE TO CONFIRM DRIVERS MEETING TIME.

Center drive configurations are not allowed at Import Showdown.

Vehicles must be street legal in all other aspects not specifically defined as allowed by rule such as, but not limited to: headlights (removal of one for air indication is allowed except where noted), cooling system & brake lights. This includes hoods, bumper covers (bumper removal ok).

Wheelie bars are only allowed in the Muscle Vs The World & Showdown classes. Strictly forbidden in all other classes.

One vehicle is allowed in one class ONLY. A driver may enter multiple vehicles and run multiple classes, However, there are no considerations made for delaying competitions to accommodate this!

Doors must open and close from inside and outside the vehicle.

Dash must remain in the vehicle, EXCEPT FOR SHOWDOWN.

All classes except Muscle Vs The World, Showdown and Modified Street must carry a recently valid registration tag (current year or previous year i.e. expired is ok, 2+ years old is not).

Vehicles can be towed to the track in all classes, assuming other street ability requirements of that class are met.

Any protests of competitors in your class MUST BE BROUGHT TO THE ATTENTION OF ISD STAFF BEFORE THE 1ST ROUND OF ELIMINATIONS, NO EXCEPTIONS!

Class Rules

Competition rules apply ONLY to the class for which they are listed under. Test and Tune passes can be made with any configuration or setup, and any modification that meets track safety requirements. Test and Tune cars can have any engine or configuration.

Muscle Vs The World Class

Pro Tree (.400) (VS marked on side windows and rear glass)

This class is open to all makes and models.

Must retain stock chassis, floorboard, firewall, and framerails. Aftermarket K-members OK. Modified radiator core support OK. Tube chassis allowed forward of front strut towers. 2 rotor and 4 cylinder cars may run back halved chassis rear of firewall. Mini tubs OK.

Must retain factory mounting points/location for front. Any rear suspension configuration allowed.

No Limitations.

No Restrictions

FWD/RWD/AWD – No Restrictions

Lightweight components limited to hood, front fenders, decklid/hatches, roof, sunroof, wings, ground effects, bumpers, and doors. One piece front ends OK. Aftermarket doors must appear factory. Factory quarter panels only. Overfenders/flares OK as long as factory metal is still in place. Removal of body parts during competition is prohibited.

Wheelie bars are allowed, but limited to a 28”x10.5″ tire if wheelie bars are used.

No Restrictions

No Restrictions

Showdown Class

Pro Tree (.400) (SD marked on side windows and rear glass)

Slicks are allowed.

Fuel cells are allowed.

Any transmission allowed.

FWD/RWD/AWD – 2 Power Adders Allowed (Turbo/Supercharger + Nitrous)

Any exhaust configuration allowed.

Wheelie bars are allowed, but limited to a 28”x10.5″ tire if wheelie bars are used.

Engine swaps out of manufacturer OK. Limited to Import engines only. No V8s.

Modified Street Class

Pro Tree (.400) (MS marked on side windows and rear glass)

FWD: Full Slicks Max 26” x 9.5″

RWD: ANY DOT approved tire

AWD: ANY DOT approved tire

Any Exhaust Configuration Allowed.

Engine/Transmission swaps allowed only within same make (Honda/Acura, Nissan/Infinity, Toyota/Lexus, etc) – Must have at least 4 forward gears

Suspension must be mounted in stock location

Lexan Windows allowed for FWD only.

FWD/RWD/AWD – Single Power Adder ONLY

Front half of interior, single seat ok.

Fuel Cells and tanks must be 5 gals or more

Transmission swaps to out of manufacturer transmissions are not allowed.

No Straight Axle Conversions.

No alternation of firewall or floor pan allowed.

No One Piece Front Ends Allowed.

Street Tuner Class

Pro Tree (.400) (ST marked on side windows and rear glass)

Turbo Size Limit 62mm for any entry. This is a “Peer Tech” rule, any violations must be brought up before first round eliminations.

FWD: Full Slicks Max 25″ x 9.5″

RWD/AWD: DOT approved drag radials ONLY.

Windows must roll up and down.

Any exhaust configuration ok.

No Straight Axle Conversions

Suspension must be mounted in stock location

Documentation of current tag and valid insurance required. NO DEALER TAGS.

FWD/RWD/AWD – Single Power Adder ONLY

Full interior required. All interior parts must be installed! NO EXCEPTIONS!

NO Lexan Windows or One Piece Front Ends.

Fuel Cells are not allowed, Sumped Factory Tanks OK

Engine/Transmission swaps allowed only within same make (Honda/Acura, Nissan/Infinity, Toyota/Lexus, etc).

  • Must have at least 4 forward gears
  • NO Electronically/Hydraulically Assisted Manual Transmissions Allowed
  • Transmission swaps to out of manufacturer transmissions are not allowed

No alternation of firewall or floor pan allowed.

10.5 Index - 11.5/ index - Bracket Class

Pro Tree (.400) (0X/1X/BT marked on side windows and rear glass)

Running faster than 10.5/11.5 will result in elimination (Rule does not apply to Bracket class)

Any exhaust configuration ok.

FWD/RWD/AWD -No restriction on power adder type or combination

No electronic timing assist devices allowed. Given the nature of some of these devices this is a “Peer Tech” rule. Any violations must be reported to ISD staff before first round eliminations.

No transmission restrictions.

All Motor Class

Pro Tree (.400) (AM marked on side windows and rear glass)

FWD: Full Slicks Max 25″ x 9.5″

RWD/AWD: DOT approved drag radials ONLY.

Any exhaust configuration ok.

No transmission restrictions.

FWD/RWD/AWD – Absolutely ZERO power adders (i.e. nitrous, turbo, supercharged, even if OEM)

Full interior required. All interior parts must be installed! NO EXCEPTIONS!

No electronic timing assist devices allowed. Given the nature of some of these devices this is a “Peer Tech” rule. Any violations must be reported to ISD staff before first round eliminations.

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