r32 cooler std is not too bad, not much use over 300rwkw but the later 34 ones are good for a bit more, i use the same trust core you just bought on the car in our avatar and spent alot of time on the dyno playing with ECU's and doing datalogs on three coolers (std, JJR and the TRUST 115mm one). i noticed whilst tuning it that the inlet temps are far more stable even over about 20-25 dyno pulls... the equivalent of road/circuit driving. The std one was pretty shit after about 10 pulls. the more stable inlet temps allowed more agressive tuning and more power. if you were to tune for one run on each cooler though they would pull the same power but after about the 10th pull with an aggressive tune and std cooler you would be well down on power due to the inlet temp ignition retard map winding in.
dont pay to much attention to the knockers on here, half of them just regurgitate shit they have heard or read.... not real world experience. i gaurantee your car with the trust cooler and a decent tune will be making peak power for more laps around a track (or more strip sessions and dyno pulls) than the same car with the std cooler.