We do not do 24v heads yet. We've just seen cr engines making power above 5,000 rpm
so we are looking more seriously at 24v heads. That being said, 99% do not need an aftermarket head. If you call the right guys ..... Nyes you can get almost 300cfm head for a cr right now. Heads are still not what is holding back cr's, it is rate of injection. In the next 2-3 years,heads will start to be restrictors to power, we hope to have an answer for you at that time.