2012 DIY Classification Guide (Updated 9-14-2012) Abbreviations: 2WD - Two Wheel Drive AWD - All Wheel Drive DIY - Do-It-Yourself MY - Model Year N/A - Not Applicable to this class No - Modification/Change Not Allowed In Class OEM - Original Equipment Manufacturer (as from the factory) SP - Street Prepared Classification (See Rule Book For  Actual Class) Stock - Same size, width, offset (+0.25") as the factory item Yes - Modification/Change Is Allowed in Class

2012 Solo Rule Book Link

Modification/Change Description (Did you do the following to your car?)

Yes or No

Stock Legal

STC Legal

STF Legal

STR Legal

STS Legal

STX Legal

STU Legal

SP Legal

SM Legal

SMF Legal

SSM Legal

Tires & Wheels

Change Rim Diameter From Stock?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Are Your Rims Narrower Than Stock?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Are Your Rims Wider Than Stock? (*Street Touring: Check Rim Sizes Below)

No

Yes*

Yes*

Yes*

Yes*

Yes*

Yes

Yes

Yes

Yes

Yes

Are Your Rims Wider Than 7.5"?  (*STR AWD only)

Stock

No

No

No*

No

Yes

Yes

Yes

Yes

Yes

Yes

Are Your Rims Wider Than 8"?  (*STX AWD only)

Stock

No

No

No

No

No*

Yes

Yes

Yes

Yes

Yes

Are Your Rims Wider Than 9"?  (*STR 2WD & STX 2WD only)

Stock

No

No

No*

No

No*

Yes

Yes

Yes

Yes

Yes

Tire Section Width Greater Than 225mm?  (*STR AWD only)

Stock

No

No

No*

No

Yes

Yes

Yes

Yes

Yes

Yes

Tire Section Width Greater Than 245?  (*STX AWD/STU AWD only)

Stock

No

No

No

No

No*

No*

Yes

Yes

Yes

Yes

Tire Section Width Greater Than 255mm?  (*STR 2WD only)

Stock

No

No

No*

No

Yes

Yes

Yes

Yes

Yes

Yes

Tire Section Width Greater Than 265mm?  (*STX 2WD only)

Stock

No

No

No

No

No*

Yes

Yes

Yes

Yes

Yes

Tire Section Width Greater Than 285mm?  (*STU 2WD only)

Stock

No

No

No

No

No

No*

Yes

Yes

Yes

Yes

Tire Treadwear Rating Less Than 140?

Yes

No

No

No

No

No

No

Yes

Yes

Yes

Yes

R Compound Tires? (e.g., Hoosier A6, Kuhmo V710, etc.)

Yes

No

No

No

No

No

No

Yes

Yes

Yes

Yes

Racing slicks (non-DOT tires)?

No

No

No

No

No

No

No

No

No

No

No

Suspension

Substituted, Removed, Or Added A Single Sway Bar? (Front or Rear)

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Changed Sway Bar Bushing Material?

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Substituted, Removed, Or Added Both Sway Bars?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Changed Rear Sway Bar Bushing Material?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Changed Spring Rates?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Installed Camber Plates?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Installed Front or Rear Shock Tower Brace?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Installed Shocks With Adjustable Valving?

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Replaced Struts With Coil-Overs Suspension?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Changed Suspension Bushing Material?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Added A Track Bar or Panhard Bar?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Did You Lower Your Car?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Brakes

Changed To Steel-Braided Brake Lines?  (*MY 1992 & above only)

No*

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Changed Diameter Of Brake Rotors?

No

No

No

No

No

Yes

Yes

Yes

Yes

Yes

Yes

Installed Non-OEM Drilled Or Slotted Brake Rotors?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Upgraded Brake Calipers From Stock?

No

No

No

No

No

Yes

Yes

Yes

Yes

Yes

Yes

Installed A Non-Stock Proportioning Valve?

No

No

No

No

No

No

No

Yes

Yes

Yes

Yes

Engine & Air Intake System

Made Any Internal Engine Modifications?

No

No

No

No

No

No

No

Yes

Yes

Yes

Yes

Is Your Engine Still Emissions Legal?

Yes

Yes

Yes

Yes

Yes

Yes

Yes

N/A

N/A

N/A

N/A

Changed ECU Software, Chip, or VTEC Controller?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Changed wastegate, pop-off valve, or supercharger pulley?

No

No

No

No

No

No

No

No

Yes

Yes

Yes

Changed Boost Control/Levels either mecanically or by software?

No

No

No

No

No

No

No

Yes

Yes

Yes

Yes

Changed To Less Restrictive Air Filter in Stock Airbox?

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Changed Stock Airbox?  (e.g., Cut Lid,  Added Cone Filter)

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Installed Larger Throttle Body?

No

No

No

No

No

No

No

Yes

Yes

Yes

Yes

Changed Intake Manifold Or Injectors From Stock?

No

No

No

No

No

No

No

Yes

Yes

Yes

Yes

Changed Cam or Valves From Stock?

No

No

No

No

No

No

No

No

Yes

Yes

Yes

Installed Emission Legal Headers?

No

Yes

Yes

Yes

Yes

Yes

Yes

N/A

N/A

N/A

N/A

Installed High-Flow Catalytic Converter?

No

No

No

No

No

Yes

Yes

N/A

N/A

N/A

N/A

Installed Underdrive Pulleys On Accessories?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Added Or Changed Turbo Or Super Charger?

No

No

No

No

No

No

No

No

Yes

Yes

Yes

Added Or Changed Intercooler?

No

No

No

No

No

No

No

Yes

Yes

Yes

Yes

Swapped Engines Other Than Strict Stock Block Replacement?

No

No

No

No

No

No

No

Yes

Yes

Yes

Yes

Added Limited Slip Differential?

No

No

No

Yes

No

Yes

Yes

Yes

Yes

Yes

Yes

Seats

Removed Rear Seat?

No

No

No

No

No

No

No

No

Yes

Yes

Yes

Changed Front Seat(s)?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Miscellaneous

Added Aftermarket Steering Wheel? (#If stock wheel not airbag equipped)

No

#Yes

#Yes

#Yes

#Yes

#Yes

#Yes

Yes

Yes

Yes

Yes

Added Short Throw Shift Kit?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Relocated The Battery?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Removed Air Conditioning System?

No

No

No

No

No

No

No

Yes

Yes

Yes

Yes

Removed passenger seat or gutted interior of car?

No

No

No

No

No

No

No

No

No

No

No

Body

Added aftermarket louvers or carbon fiber hood?

No

No

No

No

No

No

No

No

Yes

Yes

Yes

Added non-stock wing, spoiler, or splitter?  (#Spoiler/Splitter only in SP)

No

No

No

No

No

No

No

#Yes

Yes

Yes

Yes

Added Sub-Frame Connectors?

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Note: This guide is intended as a quick reference for street driven vehicles and not as a complete translation of the Solo rules.