Ill make a bet right now that the GTR manifold doesn't provide any worthwhile power gains. There is nothing inherent in its design that makes it any more aggressive of a manifold than the VHR manifold. Matter of fact, the VHR manifold is more highly engineered piece. I will be surprised to see a change of more than +/- 5-10hp anywhere in the powerband. I think its just as likely to lose power as it is to gain, only testing will tell.
If I had to **guess**, I would expect it to pick up a little torque at best.
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