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Basic fluid dynamic principles involved, but only small gains...
Not worth $60 for a spacer. All it does is increase plenum volume.
Better off with a 62mm bored TB from max bore and porting the plenum yourself more gains across the board than a spacer can offer.
When will some one stop making cheap fabricated parts for the KA and just redesign a whole new manifold with short runners since that is what it needs for more HP and high end rev?
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