[Teds89IROC]

I'm putting on new valve covers/wire looms and I'm looking at the vacuum lines coming off the back of the plenum. One goes from the FPR to the plenum and the other comes off the plenum and goes to this fitting which splits and half goes to HVAC and the other goes up to the canister in the front of the car. I ditched the canister but the ball looking canister is still next to the fender which that one vacuum line goes to. I'm just wondering what that fitting does and what that vacuum line is that runs to the front of the car to see if I can ditch it and if I should just cap them off or what. I try simple searches like "tpi vacuum lines" and I ger no results. Any knowledge on this?