Thinking of swapping mufflers but got a question pertaining to my 340

Basically from what i read you have to find a happy medium on exhaust sizes. Too large will reduce scavenging which will make it seem like the low end torque has been affected. And then too small of a pipe which will increase back pressure reducing high end performance. From a couple articles ive read says you have to find a happy medium. You want some scavenging at lower rpm but want to flow as quickly as possible at higher rpm.

"I get the maximum scavenging effect if the gas velocity is high, so the pipe needs to be small. By maximizing the scavenging effect, I help to pull pulses out of the combustion chamber, which means the engine doesn't have to work as hard to do that.

This has the most effect when there's a bunch of time between pulses...in other words, at low rpm. As the revs rise, the pulsed flow becomes more and more like constant flow, and the scavenging effect is diminished.

So, at low rpm I need a small pipe to maximize scavenging, and at high rpm I need a big pipe to minimize pressure drop. My exhaust pipe can only be one size, so it's a compromise. For a given engine, one pipe diameter will make the most overall power (i.e., have the largest area under the curve on a dyno chart).

So, the loss of torque has nothing to do with backpressure, and everything to do with gas velocity. So you need exhaust components that are not restricive (manifolds/headers, mufflers) and that are sized correctly for your application."