up early this morning aren't you cosrush? i have a rush cossie as well (4wd). last year used a 2wd interccoler with water shroud around and pumped coolant through a mini heater matrix at the front. monitored charge temp last year on a day of 32c and charge temp was 40C @ 24psi boost. other colder days it didn't rise more than 5c more than ambient. ironically, this year was going to try a 'normal' 4wd cooler in my rush but may not bother now or will shroud 4wd one (more coling area). using a 4x4 cooler on 4wd rush causes other problems though!

email if yoiu want more details / pics etc.