Charles Servedio just posted a video porting SBM cast iron intake with Thermoquad

ch1ll said

There's alot more to the rest of the engine in reaching 2.5 hp per 1cfm just like there is more to power producing flow than cfm and velocity.

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No one said there wasn't, I even stated I feel 1.8 hp per cfm is a more likely achievable goal for most compared to the 2 hp rule of thumb (obviously with the right combo).