They're recertified every two years to keep you from winding up like Dale Earnhardt. A small nick/tear in the webbing greatly reduces their strength and reliability. Therefore you have them recertified every two years to make sure there's not a nick/tear in the webbing. I pull mine out every two years and usually sell them to local dirt trackers; apparently they don't have the two-year requirement like NHRA/IHRA.
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Jeff Chambers
1990 Mustang GT 10.032 Seconds / 137.5 MPH
14-time Street Warrior World Record Setter
CRT Performance
2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH
2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2
"There's nothing boring about a small block automatic shifting gears at 9400 rpm!"
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