I reckon it would take you over 200 hp. Don't forget that the VR was not built with extracting more HP from it. The 2.9 which is just an overbored 2.8 does 190hp in the Corrado with essentially the same components.
If you want VFM power gains you need to go with forced induction. NA engines are always going to cost money to get power from.
The Schrick Manifold isn't all about top end, it uses variable inlet lengths to get a better spread of power.
Gavin
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