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BIG BOSS HOSS
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White_mk2, yes the 89+ have 2 more HP and 8 more FT - LB. of torque. Modified I have no idea what the difference might be.

Yea Bob, the 89+ ports appear to have more volume than the 87s. Some have stated that the 87s might flow better for N/A and the 89s better under boost.
 

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I was thinking the difference kinda seemed like the difference between an single and dual plane intake.... which would agree with what ya just said :)
 
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