Drivetrain swap

curious about making my 2009 dodge avenger sxt rear wheel or all wheel drive. Not wanting to do any major body change or frame work.

will need to do lots of frame work or change to frame off a rwd or awd car. lot of work

will need to do lots of frame work or change to frame off a rwd or awd car. lot of work

So converting it over to RWD or AWD would be a lot of work. Probably way more than i would want to even conceive of doing to the car period. If i was to just change out the engine that might be enough for what i am wanting anyways.

What would be some moderately quick / easy performance upgrades that can be done without having to much specialty work involved?

large exhaust with less restrictive cat and muffler. headers if they make them. cold air intake and K&N style air filter. maybe get the ecu rechipped or reprogrammed