Hey guess i'm currently in the process of buying parts to upgrade my 1996 WRX performance wise. I recently bought a Power FC and was planning on getting a tune with the stock TD04h but someone suggested i upgrade to a larger turbo such as a TD06 18G. From what i've found is that this is a pretty big turbo for a stock 2 litre and im guessing i wouldn't be able to use the full potential of the turbo without upgrading internals.

Does anyone know what kind of power i could expect a stock ej20 to handle? Or if theres another turbo which would be better suited?

Thanks.