[Chris1529]

from post above...."Also, comments attributed to an EPA spokeswoman at the end of this article seem to indicate that EPA does not intend to go after vehicles used solely for racing. However, she says “The EPA remains primarily concerned with cases where the tampered vehicle is used on public roads, and more specifically with aftermarket manufacturers who sell devices that defeat emission control systems on vehicles used on public roads.”

...that is basically what my Senator's office told me.
that being said, it is still bad news for the car performance market.