Short answer it adds to some throttle response on the LS4 however with the stock intake manifold you will gain nothing. If you were on a LS 1/2/6 /fast 90 or 102 then porting will be worth a gain.
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02-27-2014
Short answer it adds to some throttle response on the LS4 however with the stock intake manifold you will gain nothing. If you were on a LS 1/2/6 /fast 90 or 102 then porting will be worth a gain.
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