if u actually do have 420 HP and u want to disable the wastegate, then kiss u're stock turbo goodbye. They won't last. But if u want to, then just pull the hose or block the hose to the wastegate. , Also u can pull the wastegate off and bolt thewaste gate arm closed, . . or there is the turn buckle way. If u need more than 35 psi boost, spend the money and get a bigger turbo. Its cheap to add fuel, but its not cheap to add more and more air. If u don't add the air u will crack the head, crack the piston, scrore the piston and block. So pay it now or pay it later, . . good luck.