To ensure every Afcoil you purchase is the very best you can buy, each spring is quality checked. All Afcoil springs are put through a minimum of 5 separate quality checks in which the strictest specifications in the industry are enforced.  Top teams use AFCOILS for winning performance. Superior quality and consistency guarantee AFCOILS to remain within 2% of free height for life. The pros know you can’t win without dependable springs. AFCOILS are the #1 spring of the serious racer. When you need springs, check to see if they have the features of AFCOILS; if not, you don’t have the best springs.