X2 on brass and copper being the best for trail repair.
When I got my CSF I thought it was packed pretty damn well :dunno:. After I switched radiators and routed my AW-4 to a dedicated cooler I have dropped atleast 10* on the street and no longer overheat on the trail.
The stock rad is such a POS, mine constantly weeped until I flushed it, then it leaked like mad. Must have nocked some sludge loose that was keeping it from leaking