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Since my manifold will be multi-piece rather than one solid piece, I will have the ability to alter it a little bit.

My current intentions are to have a long and a short runner version.

1slow370z's manifold has very long runners, which are good for torque. They might even be a little longer than preferred, but unless you go very short, you have to be that long, because you have to put the plenum floor on either side of the intake "cams". the vertical space between the strut bar and the valvecover over the intake cams is too short for a plenum floor.

I believe I can keep stock throttle location, or be so close to it that minimal modification to the intake tubes is required... probably at most just cutting some off and adjusting the couplers.

Something long like the GTM prototype will put the throttles in such a drastically different location, that custom intake tubes will have to be made. Which isnt really a big deal, just worth a mention.

The GTM prototype manifold replaces the stock lower intake manifold (LIM) and goes straight to the heads. This is ideal for a zero-sacrifice manifold. My manifold will be using the stock LIM. Using the stock lower intake manifold reduces costs by not requiring a custom fuel system and custom rails, and will make installation marginally easier. It may come at a cost of a couple HP though. Or maybe not.

They did a very good job on that manifold and while we didnt get to see any isolated dyno runs with it, its obviously working well either way. It would have been nice to see how much it did gain and where the gains came in... but I am going to have to say I doubt that manifold lost any top end over stock, and probably gained a lot of midrange-low. It looks to me like a pretty versatile manifold and should even work well on high HP turbo cars running 8000rpm and below. My only gripe with it is packaging / size, and reduced serviceability. But otherwise as one of GTM's critics to the most personal degree, they did really well on that.

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