I have a K&N FIPK Cold air intake kit for the Vortec 4.3L V6. $100 shipped to U.S. lower 48. Paypal. It was used for about 15-20k miles, its in good shape.
link on k&n's site: http://www.knfilters.com/search/product.aspx?Prod=57-3039
link on k&n's site: http://www.knfilters.com/search/product.aspx?Prod=57-3039