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I have two speedwerx 14.7:1 inserts (6000-9000 ft) for an M8 Arctic Cat. Will work with a speedwerx head or a stock machined head. Only 350 miles on them mint shape. Retail @ $80 new each will sell set for $100 plus shipping (approx $10). Pm or e-mail rbzluvinit@hotmail.com Thanx