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Changes to runner length have a significant impact on pulse tuning and would result in a noticeable shift in the power curve. Looking at the dyno on page 1 I find it odd that the change in power band are only there after 4000rpm. In addition, the dyno plot shows no loss in power below 4000rpm and a significant gain everywhere above. I find it hard to believe that the engineers at Toyota/Subaru would have not designed a longer runner manifold to take advantage of this. I will also point out that the torque rise between 5500rpm and 6500rpm is very similar to that of gains found from tuning.
I am not saying that this product does not work, though I would like to see 3rd party tests before I am totally convinced.
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