I was running a BBSC at 9.5lbs of boost with no temperature issue even after long 20 minute track sessions. This was with stock radiator and shroud. Is there a max HP that the stock system can cool? I am going turbo and shooting for 650 whp and thinking I will need to upgrade the radiator and poasibly thr fan/shroud combo. Macattack, coz, and others have discussed these changes but not sure t what point the stock is no longer enough or if simple mishimoto resolve the issue to a certain power level. Also looks like coz has successfully used the masiv radiator anyone else use this? Any modification required. Read a bit about the masiv maybe not being will suited for traffic. I live in Northern Virginia and we'll eventually get stuck in traffic. Typically 30-45 min of stop and go but I can almost always avoid it.