Quote:
Originally Posted by Kurlon  While the resistance to low flow may not change much, removing a baffle can and does affect the percieved backpressure the engine observes by removing a reflecting wave.
This is why there is a trend for larger and larger diameter OEM canisters now, more flow/hp while retaining sound deadening ability. |
This is a useful observation. Thanks for that,
I think if you reposition the wave enough, at some throttle openings and some RPM you can actually reposition the wave so it's a vacuum when the valve opens. That's when exhausts become "magic" free HP.
Crossover pipes and EXUP values can maximize the conditions that this occurs under.