Originally posted by FUK_WRX
I know i have not heard of them at all also, i think its a little too expensive to invest on if you dont know what the results would be 
atleast the piston and liner from duratrax is nice and cheap
If the carvings are different (forget their proper name) then they will most likely not line up with the ports and you have a CV-R with .000001hp, the porting on the CV is a fair bit different to the CV too.
BTW The duratrax sleeves will not fit the CV-R, just the CV...