Naturally
On their flyer it states:
Approved Helmet (Snell 2000 or later)** Motocycle Helmets are NOT Acceptable **
A Snell 2000 should not be that hard to find. But a lot of the ones you find will be motorcycle rated ("M" for motorcycle), not AUTO rated ("SA", for special application), so be aware of the distinction.
Motorcycle helmets are tested to meet the highest safety standards in the industry from the Snell Foundation and are labeled with a sticker inside each helmet with a "Mxxxx" rating which refers to Motorcycle and the year the Snell Foundation update the standard.
Auto Racing helmets carry the Snell Foundation "SAxxxx" ratings which refers to the SA, Special Applications and the year the Snell Foundation updated the standard.
Snell updates its standards every 5 years. You may still see a '95 in the market place but most likely M2000 or SA 2000's. The newest helmets on the market carry the 2005 which is the latest update.
In order to get the Snell rating, both types of helmets must pass a series of vigorous and identical impact tests. In addition to these tests the SA standard must comply with 3 additional variances or tests.
1) The SA helmets must have a Nomex fabric liner and are therefore more fire resistant for auto racing.
2) The SA standard allows a minimum eyeport size that is smaller than the minimum allowed for the M standard
3) The SA helmets must pass a test designed to simulate impact with a rollbar.
Some manufacturers include aerodynamic features on their SA helmets auto racing car helmets that would not make sense to put on the M helmets for motorcycling and many SA helmets are available with provisions for forced air cooling or emergency air supplies that are inappropriate or unnecessary for M helmets. Manufacturing costs being what they are... most manufacturers build their SA and M helmets identically with the exception of the inner liner.