brian129

I know this is Miata Turbo, and I am asking an N/A question, but this seems to be the most scientific and knowledgeable place left for Miata info.

I am planning a high horsepower N/A VVT build that I’m swapping into a 1.6 SM racecar that I am turning trackday fun car (add HP and Aero). Maruha Cams, JDM VVT 10.5:1 pistons, home ported head, squaretop, MSPNPpro.... hoping to get to 170hp or so.

The running consensus for a header for this level of build seems to be Maruha ($$$$), Maxim works ($$$) or Racing Beat ($).
Being this is a budget minded project (or started that way) I have been looking for a an NA8 Racing Beat header, but they are out of stock, and used are in high demand.

In my research I saw that it looks like Goodwin has taken the Racing Beat header and reverse engineered it into their own RoadsterSport Header
https://www.good-win-racing.com/Mazd...t/61-2719.html

Has anyone tested one of these and tried it back to back on a dyno? Compared to the Racing Beat?
it looks like a pretty good copy, but I searched and did not see reference to it.