Here's detailed dyno result for switching from SSIs to headers. The first post has side by side dyno results, only change made was removal of the SSIs and swapping to headers. I have seen the exact same result on other 3.2 and 3.4 Single plug engines I helped on.
https://forums.pelicanparts.com/porsche-911-technical-forum/1077817-84-89-3-2l-upgraded-3-5l-267-wheel-hp.html
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Sal
1984 911 Carrera Cab M491 (Factory Wide Body)
1975 911S Targa (SOLD)
1964 356SC (SOLD)
1987 Ford Mustang LX 5.0 Convertible
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