A couple points here.
A suppressor doesn't quiet the bullet, it only captures the gasses escaping the muzzle, and allows them to expand and cool inside the suppressor, thus quieting the muzzle blast.
If the projectile, or bullet is still supersonic, it will make a noise as it breaks the sound barrier at approx. 1100 feet per second, a small "sonic boom".
There may be residual noise that escapes the breech when it opens, as there may be residual pressure from the firing of the cartridge, and the suppressor contains the muzzle blast, instead of allowing it to escape freely into the atmosphere. It thus may cause some "back pressure". Most folks who own "cans" can speak to this.
The oil filter adapter is ATF trouble waiting to happen. The minute you screw an oil filter onto the muzzle of your firearm, you have an un registered NFA item. ATF does not have a sense of humor about this. You should have VERY deep pockets to pay an attorney if you plan on having to fight the feds in their courtroom.
Just buy a commercially made can and pay the tax. Way cheaper and easier. Plus, a well made can is kinda nice.
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