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stiffer valvetrain components
ported head/ intake manifold
larger bore throttle body
stronger rods/pistons/crank
higher CR
larger cam lobes
stiffer suspension
shorter gear ratios (including final drive)
exhaust
Numerous "small" differences (a/c compressor hanger/less sound deadening, valve cover/ etc)
For the same amount of money you'll pay to go from a GSR to a Type R, you could turbo a GS-R and spank Type Rs up and down the block.
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