Dude take it from me.... I have a turbo 420a.

If you want to turbo it, you must have the engine ready for the turbo. Rebuilt the engine with quality parts. Do not buy cheap shit. Also expect to max out at low horsepower. You are capable to reach 300-350 horse power because before my car got it's internal built i was at 215whp. So it's possible but you're very limited. I love being the under dawg though.

If you're wanting to race your car and win then I recommend you to save money for a 1st gen eclipse GSX. That's the best eclipse you'll get. Block is better and stronger except for the transmission but who care's you'll up grade that.

Don't thing about an engine swap because it will cost you the same if you just buy another eclipse. Dude be very patient that the best advice I can give you.