Replacing the Stock WRX intercooler?

[JohnA]

Originally Posted by mrex180

So John whats best to look at then EGT rather than IAT with WI?

Neither :wink:
Knock would be my main consideration

EGTs are affected precious little by W.I. (strange but true!)
IATs are affected only a tiny bit - depends mainly on the location of the nozzle, post-ic temps and methanol content

Emergence of knock's ugly head is what WI is meant to fight best.