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The benefits extend further than peak hp and torque gains. Driving elements like on and off throttle response are big advantages that are difficult to quantify but still significant. In addition, an engine builder can tune where the engine makes peak power by varying the intake runner lengths.


IMHO, an ITB system has the most value in engines with a high state of tune instead of a stock/near stock engine so that max hp gains can be reached. But each owner is different and has different priorities and desires. IIRC, my 3.6L went from 333rwhp to over 373rwhp with the addition of ITBs.


It'd be really tough to go back.


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