SEMA has made an official clarification, I got it today in my SEMA news email. Sounds like they see this as a serious threat to our industry and they feel the EPA is out of bounds in what they're doing. I don't think this should be taken likely in any way at all.
Although this is targeting race only cars, it absolutely translates to targeting street cars too. If at the very least the EPA shuts down production of performance parts for emissions equipped cars rather than chasing down offenders at races, this will not only require a race car to be stock engine configurations, it will cease us putting a GT40 intake on a Fox Body Mustang, or a dual exhaust kit sans cats on your 75 Camaro, or headers on your 69 Camaro if it came with an air pump, despite the fact that it's a street driver and not a dedicated race car.
Again I propose this is a foot in the door to pose more regulation in the future. How boring will it be to see a stock 180 hp G body running down the drag strip. Mine ran 17.9's stock, that's >cough< cool. Not! If we as enthusiasts put a leash on it and oppose this regulation now it makes it that much easier to negotiate in the future. If we take it lightly and let the EPA gain control, it will do just the opposite and they will regulate our hobby into boring melancholy.
Click here to read SEMA's article...
SEMA Myth/Fact write up