Hello everyone, I’m currently stationed in Okinawa Japan and own a 2003 Impreza wrx sti (blob eye). I’m looking into upgrading my turbo with a bolt on turbo. The engine comes forged from the factory and I assume I’m okay to run some more horsepower. I would like to know what the best options are for bolt on turbos that won’t destroy my engine. Looking for 500-600 hp at the end of my journey. Thank you for your time.

I plan on upgrading that with time, but I’m curious what the best bold on turbos will be for that.