Head gasket possiblity: Eagle Talon?

Bought a 95 Eagle Talon TSI AWD that's upgraded and practically a race car already but overheats. The obvious reason is air getting into cooling system but no noticeable leaks except a lil from passenger side of motor.

All I know for sure are these things..

1) coolant loss

2) overall no obvious leak

3) air in cooling system which leads to overheating

4) replacing radiator cap makes no difference still lowered sitting still

5) if run with cap off n funnel it rises normally but drops below topped off when cutting off car

6) everything is replaced or upgraded on car and runs good except for overheating

7) if hitting it hard repeatedly the turbo seems to make heat faster

8) even running easy barely hitting turbo much it will eventually overheat

9) it will eventually be low on coolant with air in system running or not

Help me please because I want to remove ALL other possibilities before ripping open this engine.

THanks in advance