After 2006 Street Pro class dominator Andy Simon 's zero - degree cylinder head was deemed illegal early in the season , Johnson emerged as the man to beat in the category .
Zach Johnson enjoyed one of his most successful seasons yet .
After 2006 Street Pro class dominator Andy Simon 's zero - degree cylinder head was deemed illegal early in the season , Zach Johnson emerged as the man to beat in the category .
Zach Johnson enjoyed one of his most successful seasons yet .