Dont fool with the oil filter adapters. They are nothing but trouble with the atf. If cost is the concern then start reading up on "solvent trap" kits. You can buy cool end caps, the main tube, thrrad adaptets and the "K" cups all premade. Do an efile form 1, have the tube engraved, drill the cups and end cup oit and you have a suppressor for about $300 plus a tax stamp. OR check out hunter town arms. No fuss, no muss, just decent suppressors for a low price. And to retort the post above, suppressors are awesome and addictive.