Exhaust + Oil Question

[mkiiisupra]

First off ill start with the known problem, Leak in top right of radiator. Holds coolant for most part, sometimes spits it out into overflow onto intercooler and i have to add more to overflow. Radiator stays full however.


~~Checked oil today after running car back from work noticed small bubbles on backside of dip stick. Does this mean anything?

~~Also put on a new exhaust and inside of exhaust tip turned black, this normal or am i running very rich? Something else maybe?

Not a mechanic heh, appreciate the responses.