Sean's Diablo HDi Stage 2 168bhp & 290lbsft

[Midnightclub]

IMO there's no point going bigger unless you're running silly boost, easy way to see, feel both sides of your cooler and see how cold the opposite side is, it'll tell you how well your intercoolers working.. As for lag, a bigger cooler would mean marginally more lag, something i doubt you'd notice though