I have been running the champion on my 510 for over a year now, besides the initial install problem of the brackets being welded flush with the rad and needed spacers (skateboard bearings) and 2 old hoses that burst with the first 2 test runs from finally being under full pressure I haven't had a single problem. I haven't even added any more water/antifreeze to it since.
L18, weber, 2' exhaust. Never has gone beyond M with 90 degree heat running it hard from portland to eugene (100 miles)