Since some has mentioned that a 318 won't pull enough air to open the secondaries, would it be wise to cap off some of my vacuum options like the brake booster?
Sure, why not!! If capping any of these items makes ANY difference at all they are broken and should be replaced.
Even if you needed the secondaries to be open when you're pressing hard on the brake pedal, a properly functioning booster would let it happen. If only briefly.
