Without replacing the cylinder head, it hard to get any real gains, once the head is done ,the other components come into play
Head fitted - plus 16bhp
manifold fitted -plus 10 bhp
other external items then start to work and add bhp-filter/exhaust/ etc
large jump in torque too with the head and Manifold
remaps cannot flow more air through the engine-hence little gain other than raising the rev limit,and opening the throttle faster |