This sounds like way too much hassle and cost. Also, you do not know what additional parts are needed and a different ECU would be needed. You are better off selling the car and getting another newer car that has the performance that you want.

This is the same advice I give to people who want to do an addition or big remodel to their house. You are better off selling it and then buying something more in line with your requirements/wishes.

 

There is alot of sentimental value attached to the car so I cant sell it.

 

As @Jagpilot says, you'll need a Kompressor ECU plus engine wiring harness and K40 replay unit, have the donor ECU immobilizer unlocked, you'll need the air filter housing, all the pipework to and from the I.C., Maf housing and associated pipe work to the T/B. Besides all that, the compression ration is lower on the 230K than the 230, how much of an issue that may cause I'm unsure (possibly little) and I suspect that cam profiles are different between both engines. Ideally you'll also need the engine valve cover and the breather pipes/hoses and I think the dipstick and tube too. The diff ratio between both could be different as well. Worth checking if the 230K has a larger radiator.
Still, it's possible. The ECU being the obvious issue, there may be other issues too, I'm unsure as I never gave such a conversion any thought.
Personally, I'd sell and buy a C230K. Spend 250 bucks on it and have an extra c.70bhp over the C230.

 

As @Jagpilot says, you'll need a Kompressor ECU plus engine wiring harness and K40 replay unit, have the donor ECU immobilizer unlocked, you'll need the air filter housing, all the pipework to and from the I.C., Maf housing and associated pipe work to the T/B. Besides all that, the compression ration is lower on the 230K than the 230, how much of an issue that may cause I'm unsure (possibly little) and I suspect that cam profiles are different between both engines. Ideally you'll also need the engine valve cover and the breather pipes/hoses and I think the dipstick and tube too. The diff ratio between both could be different as well. Worth checking if the 230K has a larger radiator.
Still, it's possible. The ECU being the obvious issue, there may be other issues too, I'm unsure as I never gave such a conversion any thought.
Personally, I'd sell and buy a C230K. Spend 250 bucks on it and have an extra c.70bhp over the C230.

Do you know of a more probable way that I'd be able to add a reasonable amount of power to the car without selling it.

 

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By doing this, you get the sensor outside of the exhaust stream, fooling the ECU into thinking it is too lean, thereby increasing the fuel output at the injectors. This will lead to eventual catalytic converter damage. Also, if you get caught with this on a visual smog check inspection, the car will fail, unless you don't care about this. Not sure how much HP gain would be with this spacer.