When Colin Garrett rolls to the green flag in next Saturday night’s whosyourdriver.org NASCAR K&N East Twin 100s at South Boston Speedway, he’ll have a bright yellow rookie stripe on his rear bumper. But when it comes to South Boston Speedway, he’s far from a rookie, which should make up for some of his K&N inexperience. He was South Boston’s Limited Sportsman champion a year ago and has two full seasons in that division on the .4-mile oval.

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