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.