Quote:
Originally Posted by Frank Lee
That's for "wet" manifolds; carb'd or throttle bodied with fuel and air flowing through. Most anything newer is port injected and the manifold runs "dry". Don't know what prevailing theory is on intake smoothness but I'd think the smoother the better.
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Back in the 00's, Mazda used a variable " tumble/swirl " mechanism to increase turbulence in the intake port at low rpm and idle, to go along with their variable length intake runners.