Quote:
Originally Posted by Tcoat
Exactly!
They are showing WHP which can be increased by a pile of things.
There were so many small changes made to the engine that to be able to say the manifold does X is impossible. Especially since any number you get will be well below the margin of error in the dyno in the first place. Dynos can easily show a variation of 10 or more HP with the exact same car on the exact same day. They are not precision instruments.
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The variance in the shape of the curve is somewhat telling though. That appears to be a pretty large gain at the very top, ~15 whp according to the dynos above, when the curves follow each other almost exactly throughout the rest of the graph.
I think celek was saying that anyone looking to increase the redline via a tune would do well to run the newer intake manifold. Not that the manifold itself is responsible for the increasing redline.
Ultimately, I don't spend enough time in that RPM range to bother investing money into it.