[Sinister]

Originally Posted by 68Stepbed

Actually a larger air filter(taller than 4") will start to rob HP. Carbs and engines rely less on the amount of air, but the velocity. Look at runner designs in heads. A smaller runner creates a higher velocity, making more torque. Whereas a large runner flows more air but with less velocity, making less low end torque but better for top end HP. That's why a head and cam mismatch can make for an engine that won't run good. For example, Petey-Pablo's filter setup may be robbing some torque, but may make better top end HP. On a big block, it's worth the trade off. A small block, however, would not benefit at all from a taller air filter.

Back on the topic at hand, I can see where the Xtreme top can disturb the airflow. In theory, it should make more power, but airflow characteristics are kinda wierd and hard to understand.

X2. I've experimented in the past with different air cleaner sizes and bigger was not necessarily better. Lost a lot of torque down low when I went too big.