1975 Mercury 200 20hp motor

[buddhapi]

a customer brought me in this 20hp Mercury motor with the lower unit removed and no idea what was wrong with it. water tube missing no problem as I found one of them already, but I'm not seeing any kind of exhaust tube or anything. I'm used to working on 40hp or bigger. does this motor not need an exhaust tube of some sort? I don't see anything on the parts micro fiche pic's either

 

[merc850]

I think it just goes down the driveshaft housing and out the prop.

 

[buddhapi]

that's what I was thinking too. since it's not in the photos, I don't think I'll bother searching. I'm just used to working on 40hp and bigger I guess