The difference in lag with a bigger cooler is tiny, you wont notice it.

If you want a significant hike in power though, try moving to a GT3071 or similar turbo.

You'll slightly increase the boost threshold (ie the number of rpm you need to be doing before the turbo spools) but it shouldnt have anymore lag (the time taken to build boost during the boost threshold when going from almost closed to fully open throttle)



What chip are you running? how much boost do you run?

Its possible your current hardware (other than injectors) has another 50bhp left in it.


2wd manifold shouldnt cause any notable change in lag from the 4wd one and is capable of flowing more gas (ie can make more power) ultimately, you must have had some other problem when you fitted one.