Anyway you can turn a 2003 Acura cl 3.2 base, into the Type-S version

I'm prretty sure you can the only difference between the two is ecu changes n cosmetics

So I can do a engine swap and change out the ecu, but will I need to do any modifications to get it to work?

the diff is the head intake manifold headers and ecu

Throw on a cold air intake, do the headers and exhaust, and put a Unichip in that bad boy and you'll be fine. Eibach makes a nice kit so you can lower it and tighten up the suspension for a sportier ride. Enjoy the gar regardless, nothing wrong with 200hp as is.

I would recommend a cold air intake, headers, exhaust, pulley, lowering springs for cornering, spark plugs, ecu chip, dyno tune, and some performance tires. That's a bit more then a type s but those mods would make it a monster.