I didn't want to risk overheating the new motor on the track so I replaced the
wimpy stock radiator with a thick core Fluidyne:
Comparison pic of Fluidyne vs the stock DSM radiator:
The stock radiator is actually thinner than it looks. What you see in the pic is just the bracket. The core itself is even thinner.
Installation is a breeze since it's a direct bolt on. Just lift the radiator out of
the car and remove the cooling fans and temp sensor:
I decided to be anal and filled the radiator with
distilled water/coolant instead of regular tap water/coolant.
Adding some Redline WaterWetter wouldn't hurt either. Also,
supposedly mixing less coolant vs water gives better cooling so I
mixed an approximately 40/60 ratio.