To be honest mate, mine suffered badly last year runnin standard rad, was in the red after 5 hard laps of combe. Changed to a pace one, flushed the whole system through and added a bottle of 'redline water wetter' into the mix and made a substantial difference to the temps the next time i went out on the same track! Temps didn't go much above halfway on the gauge and that was in warm weather givin it a good hidin! Don't really know how much difference the water wetter made but to be fair i really do think it helped, as well as the new rad. Strange cos some people seem to have the problem even with an alloy rad....strange