Thinking of doing some upgrades....for autocrossing. Without changing rad what can be done? thermostat, who makes a big fan replacement for the current 2 fan setup? Any ideas appreciated.

 

You can get a lower temp thermostat and switch from Mugen and get a bigger slim line fan from Spal. Without changing the rad, isn't too much you can do. If you do decide on an aftermarket rad the Fluidyne or C&R rads fit the Prelude and are twice as think as stock. Water Wetter is also a good idea.