Inliners International Forums General Discussion Engines 4 brrl on 250

Tom has the dyno numbers to say for sure,
but I'd think that you'd be better off
with the headers alone.
It probably won't give any significant power increase,
but it'll provide better sound.
I expect the carb and manifold won't be cost effective until you change the cam and have improved exhaust.

On my otherwise stock 235, I got about a 7 HP increase with an exhaust upgrade

regards,
Leon