. My needs in an RV-7 would be in the 160-180hp (actual cruise
> power setting) & someone in an RV-10 would need 190-210 actual cruise hp.
>
> Charlie

Charlie,
160 to 180 hp I would use a side port 13B with Mistral's manifold.
For 200 + I would be looking at the PP.
The Jury is out on the RX8 until there's a replacement manifold, as I
believe the additional HP is in the complex manifold design.
George ( down under)