You didn't look in the 'Porting and engine tuning' section in the FAQs then? - viewtopic.php?f=20&t=6512&p=41251#p41251

The CR Rad valve has a larger intake diameter than the CRM one. This won't effect peak power but it will give you lower mid and low range torque. The CRM one also has an oil pipe.

I read it knackered thank you for you valuable info , and I don't mind if you want to edit this for easyier reading, I personally just could not find the crm one anywhere, Boyeson took over 2 weeks to reply to several emails and I thought I was at a dead loss, so I jumped the gun seeing a cr rad valve on eBay for $160au as it was a good price ($360au in stores locally ). Seems that there is no one holding the crm one in stock online or instore besides Boyeson, that I could find, I could be wrong.
So it was more about where to find them if anyone was having trouble getting there hands on the RAD02SJ, like I did.

chops my story is almost identical to yours (or yours is almost identical to mine) boyesen didn't reply to me at all, my local mx shop said there supplyer had 1 left so i grabbed it without hesitating.

knackered a larger intake is good for a larger carb then?