| 2011 DIY Classification Guide | Updated: 6-18-2011 | ||||||||||
| Abbreviations: 2WD - Two Wheel Drive AWD - All Wheel Drive DIY - Do-It-Yourself MY - Model Year N/A - Not Applicable to this 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 |
2011 Solo Rule Book Link | ||||||||||
| Modification
Description (Did you do the following to your car?) |
Yes or No |
Stock Legal |
ST 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 | |
| Are Your Rims Narrower Than Stock? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | |
| Are Your Rims Wider Than Stock? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | |
| Are Your Rims Wider Than 7.5"? (*STR AWD only) | Stock | No | No* | No | Yes | Yes | Yes | Yes | Yes | Yes | |
| Are Your Rims Wider Than 8"? (*STX AWD only) | Stock | 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* | Yes | Yes | Yes | Yes | Yes | |
| Tire Section Width Greater Than 225mm? (*STR AWD only) | Stock | 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* | Yes | Yes | Yes | Yes | |
| Tire Section Width Greater Than 255mm? (*STR 2WD only) | Stock | No | No* | No | Yes | Yes | Yes | Yes | Yes | Yes | |
| Tire Section Width Greater Than 265mm? (*STX 2WD only) | Stock | No | No | No | No* | Yes | Yes | Yes | Yes | Yes | |
| Tire Section Width Greater Than 285mm? (*STU 2WD only) | Stock | No | No | No | No | No* | Yes | Yes | Yes | Yes | |
| Tire Treadwear Rating Less Than 140? | Yes | No | No | No | No | No | Yes | Yes | Yes | Yes | |
| R Compound Tires? (e.g., Hoosier, Kuhmo V710, A032R) | Yes | No | No | No | No | No | Yes | Yes | Yes | Yes | |
| Suspension | |||||||||||
| Removed, Changed or Modified Front Sway Bar? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | |
| Changed Front Sway Bar Bushing Material? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | |
| Removed, Added, Changed, Or Modified Rear Sway Bar? | No | 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 | |
| Changed Spring Rates? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | |
| Installed Camber Plates? | No | 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 | |
| Installed Shocks With Adjustable Valving? | 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 | |
| Changed Suspension Bushing Material? | No | 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 | |
| Did You Lower Your Car? | No | 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 | |
| Changed Diameter Of Brake Rotors? | 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 | |
| Upgraded Brake Calipers From Stock? | No | No | No | No | Yes | Yes | Yes | Yes | Yes | Yes | |
| Installed A Non-Stock Proportioning Valve? | 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 | Yes | Yes | Yes | Yes | |
| Is Your Engine Still Emissions Legal? | 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 | |
| Changed wastegate, pop-off valve, or supercharger pulley? | 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 | Yes | Yes | Yes | Yes | |
| Changed To Less Restrictive Air Filter in Stock Airbox? | 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 | |
| Installed Larger Throttle Body? | No | No | No | No | No | No | Yes | Yes | Yes | Yes | |
| Changed Intake Manifold Or Injectors From Stock? | No | No | No | No | No | No | Yes | Yes | Yes | Yes | |
| Changed Cam or Valves From Stock? | No | No | No | No | No | No | No | Yes | Yes | Yes | |
| Installed Emission Legal Headers? | No | Yes | Yes | Yes | Yes | Yes | N/A | N/A | N/A | N/A | |
| Installed High-Flow Catalytic Converter? | 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 | |
| Added Or Changed Turbo Or Super Charger? | No | No | No | No | No | No | No | Yes | Yes | Yes | |
| Added Or Changed Intercooler? | No | No | No | No | No | No | Yes | Yes | Yes | Yes | |
| Swapped Engines Other Than Strict Stock Block Replacement? | No | No | No | No | No | No | Yes | Yes | Yes | Yes | |
| Added Limited Slip Differential? | No | No | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | |
| Seats | |||||||||||
| Removed Rear Seat? | No | No | No | No | No | No | No | Yes | Yes | Yes | |
| Changed Front Seat(s)? | No | 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 | |
| Added Short Throw Shift Kit? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | |
| Relocated The Battery? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | |
| Removed Air Conditioning System? | No | No | No | No | No | No | Yes | Yes | Yes | Yes | |
| Body | |||||||||||
| Added aftermarket louvers or carbon fiber hood? | 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 | #Yes | Yes | Yes | Yes | |
| Added Sub-Frame Connectors? | No | 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. | |||||||||||