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Curious myself as to how ITBs would increase any torque/hp. I can see if runner lengths where shorter shifting power higher for higher peak number but,
From my understanding stock manifold and throttle body are both more then high enough flowing that increasing diameter on either has no benefit, as well as the runner length seems to already be optimized for top end power so much so that some people opt to use manifold spacers effectively increasing runner length to slightly shift peak power down.
So unless you are building the head with cams, valves, and springs to rev to 8k+ and maybe getting an ace 150header for a high revving NA beast. Not sure decreasing intake runner length would have any positive effect.
Seems like you are essentially paying 2,000$ + tuning costs for slightly quicker throttle response and the sound associated from ITBs.
But I would love to be proven wrong. If this shows a solid 10whp increase from at least 4500-7500rpm then I am sold. Just don’t see how it’s possible.
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