Buy OEM 2003 Subaru Part # 21820AA186 (21820AA185, 21820AA280). INTER Cooler. Intercooler If your Subaru is equipped with a turbo and you've noticed a reduction in acceleration or a hissing on

Intercooler.

INTER COOLER ASSEMBLY Intercooler

Fits WRX

Intercooler
If your Subaru is equipped with a turbo and you've noticed a reduction in acceleration or a hissing on acceleration accompanying your check engine light, your intercooler or its piping/tubes may need to be repaired or replaced.