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is that the the 50mm ones have better low end response. This is called the venturi design of the stock manifold by utilizing the 50mm TB to speed up air velocity. We know this is critical to low end response. By using a larger 60mm TB, this is negated. Hopefully with 60mm IC pipings and IC in/outlets, the topend can improve to justify this mod.
www.ztechz.net ICQ # 14337317
 
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