Ok i drove a turbo skyline today and the torque was massive, spinning wheels in 1-3rd gear, now in my NA i can spin em in first and a bit in 2nd, but in 3rd . Seriously what can be done to extract heaps more power from the NA engine without turbocharging, ive done filter and zorst. Will boring out and porting the head make a huge difference ? im sure our little 2.5 (or 2) litre engines can make a heap load of power if it is tinkered with fully! ne suggestions ppls ? and no one say BUY A TURBO cos i dont plan on doing that! Neone interested in extracting more power out of their engines, cos im gonna go to workshops and find out how much can really be extracted out of them