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ok.This excellent summary text was penned by Kenny...aka "Mr Blonde" on Bimmerforums (and many other forums!). Hope you don't mind it being posted up on here Kenny....
Most of this stuff is applicable to the UK drag racing scene also and if your planning on going FAST (really really competitively fast!) then most of it is vital stuff.

NHRA Rules for Street Cars
Given the recent surge in interest for drag racing in the BMW FI ranks I've taken a look at the NHRA documentation to determine what the rules are for our cars.

Note that this is my understanding after reviewing the NHRA documentation. The 2005 NHRA ET quick reference chart below gives you pointers to the relevant area of the general regulations. The PDFs for this and other good information is available on the NHRA site.

Note that the requirements are grouped into six ET bands:
+ 6.00 to 7.49
+ 7.50 to 9.99
+ 10.00 to 10.99
+ 11.00 to 11.49
+ 11.50 to 13.99
+ 14.00 to slow

Some of which are interest here and some not.

I'll pick out the rules applicable to cars 10.00 and slower.

1.3 Exhaust: All street stock must be equipped with functioning mufflers and may be required to meet maximum decibel levels at certain facilities.

1.12 Supercharger: Screw type supercharger prohibited.

1.15 Vent Tubes, Breathers: Tubes must terminate into a permanently attached catch tank with min capacity of 1 gallon. NHRA may introduce mandatory breather systems on all nitrous injected and/or boosted engines.

2.4 Driveline: All RWD 13.99 or quicker with slicks and 11.49 or quicker with street tyres must have a tailshaft loop.

2.5 Flywheel: Stock cast type flywheels prohibited for cars running 11.49 or quicker. Must use SFI Spec 1.1, 1.2, 1.3 or 1.4.

2.10 Flywheel shield: 11.99 or quicker require a flywheel sheild SFI 6.1, 6.2, 6.3 or 9.1.

2.14 Automatic transmission: Quicker than 10.99 or faster than 135 MPH require tranmission shield meeting SFI spec 4.1

4.8 Parachutes: Mandatory for cars 150 MPH or faster.

4.10 Roll bars: Mandatory in cars 11.49 or quicker. Mandatory for convertibles 13.49 or quicker.

4.11 Roll cage: Mandatory in cars 10.99 or quicker or faster than 135 MPH. Cars with unaltered firewall, floor and body running between 10.00 and 10.99 roll bar permitted in place of roll cage. I do not believe that this applies to a convertible: they require a rollcage.

6.3 Window net: A ribbon type SFI Spec 27.1 mesh type window net is mandatory on any car required to have a roll cage.

8.2 Delay Boxes/ Devices: Prohibited in all vehicles.

8.4 Master Cutoff: Mandatory if battery is relocated or if car is 135 MPH or faster.

9.1 Computer: Traction control prohibited.

10.3 Arm Restraints: Required for any car that must have a roll cage. Convertibles require arm restraints if 11.99 or quicker.

10.4 Credentials: Each driver must have a valid unrestricted state or government issued driver's licence or NHRA competition licence.

10.5 Driver Restraint Systems: Quick release 5 point 3 inch harness SFI Spec 16.1 mandatory in cars that are required to have a roll bar or roll cage.

10.6 Head Protector: In any car with roll bar or roll cage a padded head protector must be provided at the rear of the driver's head. Also required if car 135 MPH or faster.

10.7 Helmets: Drivers must wear an SFI or SNELL approved helmet. 13.99 or quicker require Snell 90, 95 K98, 2000, SFI 31.1A, 31.2A, 41.1A or 41.2A specs.

10.8 Neck Collar/Helmet Restraint Device: Required with helmet.

10.10 Protective Clothing: Drivers are required to have as a minimum:
- 11.49 to 10.00: Jacket meeting SFI Spec 3.2A/1. All drivers are required to wear full length pants to the ankle, shoes and socks. Nylon clothes and open toe shoes prohibited.

10.11 Seat belts: All cars not required to use SFI Spec 16.1 harnesses must be equipped with accepted quick release driver seat belt.
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