I always found it all interesting. We've all heard of 'hemi', but now pent roof across the board, that found adding just the right amount of turbulence on the

I always found it all interesting. We've all heard of 'hemi', but now pent roof across the board, that found adding just the right amount of turbulence on the intake side led to power gains. Also on exhaust side. Too big of exhaust, such as 'open exhaust', is worse in most cases than restrictive. Apparently a restrictive exhaust provides both accounted for backpressure, and at times a bit of a vacuum effect. Anymore, I just trust the makers know what they are doing and go with it. But 40 years ago, very different story. My 2019 Colorado would outrun my old 66 mustang, both in stock forms.