Love my champion so far. I haven't towed with it yet, but I have driven around town and on the freeway. With the old radiator, my truck idled at 210 degrees. Freeway speeds it held around 225 to 230.
After putting in the champion, albeit with a new water pump, thermostat etc... I have yet to see 200 degrees idling or at 70 mph.
My old one was clogged similar to that. I would bet the spectra will be a marked improvement over that plugged original!