My 95 has it maybe it’s a 94-96 thingIts the muffler for the smog system, and ive never seen it have a tube on the outboard end. On 100s of these trucks.
The plastic "coffee can" is the air inlet filter. The metal coffee can is a vacuum reservoir. The black box below the battery is the charcoal canister and it traps fuel vapors from the tank, and releases them into the intake when under load.