If you want to know if your vehicle is legal to take to the track here is how you can find out if you are questioning any modifications you have done.

NHRA Rule Book: http://www.nhra.com/tech_specs/sportcompact/2008_SC_Rulebook.pdf
*NOTE* 2010 Rule Book is just being released...................for additional info visit NHRA's site: http://www.nhra.com/
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IHRA Rule Book:http://www.ihra.com/competition/index.php#rulebook
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