2009 mitsubishi eclipse base modle
 

I'm looking to upgrade my cars engine and make it preform better, I bought it for cheap to work on any idea where I should start?
At some point maybe a full engine swap and conversion to rwd but for now just want to fix up the engine itself.

https://cimg7.ibsrv.net/gimg/mitsubi...1a0f1153f8.jpg