Swap Legacy for Impreza

Looking to swap my recently bought Legacy RS. She makes a great Missile Matsuri car but I'm looking to trade it for a more competitive and powerful Impreza. Need to knuckle down and tune me a competitive car. No doubt I will get this car again to complete my garage further down the line.

Car is pretty standard engine wise but shes been stripped out and equipped for your Missile needs, converted to RWD and suspension, roll cage etc.

What are the engine swap options for that car? might be able to get impreza power without impreza price.

Kenco, if you want to sell it, I will but it from you.
Not sure if you are still going down this path or not. I am keen to try this car out and see if it can be competitive.

I'd rather swap this for a cheap standardish Impreza or wait and give this more power. I'd like to keep it though I have a little love for them.