Purchased mine from Honda Pinetown. They knew it as a CRF230 power-up kit. Over the counter, ex stock.
Now this is the kind of dealership I like 
Just a pity I am up in JHB.
Here I just get blank stares... 
If I may ask what did you pay for the kit?
Was it difficult to install?
What was the performance gain like?
Apologies for all the Questions but there is little first hand info out there about this mod...
Did the mod about 3 years ago and at that stage it cost around R430.00 As for the power gains it is essential for getting a heavier rider around. You do need to un-cork the exhaust at the same time, and pull the "snorkel" out of the airbox. I also tore the wire-mesh screen out of the airbox. As for DIY install of the "power-up kit" - easy job for anyone who's handy with a screw driver.
Just a little detail about the "Power-up Kit" The needle and jet that they supply essentially restore the bike to its original spec. The bike is de-tuned to conform to Californian emission's legislation, hence the plugged up exhaust and as a result they have to run it slightly leaner to compensate.
But once the mods are done the bike is more then capable of keeping up with anything else in the tight stuff. IMHO it's less tiring on the technical stuff than anything else I've ridden.
Let us know how it works out for you. Looking forward to the updates.