Got a GRS on mine with twin kenlowe fans mounted behind on a pace alloy rad....no problem with water temps on the road even in the summer, obviously it gets hot sat in traffic for long periods of time don't think u'll stop that totally. As Mark lgx said...can't compare fast road driving to track drivin, i can drive it as hard as i want in the middle of summer n rver go above halfway as long as i'm moving....on track tho it's a different story! On the hottest days when pushin hard i too need to have a cool down lap after about 10 mins, temps rocket, that's running 1.5bar boost. Airflow's not a problem i wouldn't have said, i've dropped my grs down from where they're meant to mount and there's plently of air gap between the cooler and rad so i can only put it down to the radiator not being efficient enough. I'll see what happens this year but may have to look into a bigger radiator....either custom or cossie one or somethin??!