Sootbox

I have changed hoses ,radiator,thermostat I now have a leak at the rear of thermostat housing ,it looks like the littl pipe coming out of the thermostat housing what is this pipe? Or could it be the housing just not tightened up enough? It’s a 2002 wrx bug eye wagon

alcazar

iTrader: (2)

Not the front crossover pipe?

Sootbox

Apparently it’s the oil cooler pipe? Little 90degree pipe ordered a couple but looks a pig to replace?