A lot of people in the Corvette world mistakenly think that the only way to get a particular exhaust sound is to use a flat-plane crankshaft. You can show them videos of Corvettes with equal length headers and they'll insist that the car must have a custom crankshaft in it.

<p>They're just as wrong as the people in the Subaru world who mistakenly think that "boxer rumble" is a thing. It's as if they never noticed that the "boxer rumble" goes away when someone puts an equal length header on the same engine, and it sounds just like a Honda.

<p>The key thing is that the exhaust pulses reach your ears with equally-timed intervals between them.

<P>Flat-plane cranks make it easier to get that result, but cross-plane cranks sound the same if the header has an equal length between each exhaust port and the point where all of the pulses come together (which is usually an x-pipe, but in true-dual setups the pulses still "come together" at the exhaust tips).

<P>People get hung up on the fact that the ignition events <i>within one bank</i> of an LS engine aren't equally timed, but that doesn't actually matter. The ignition events <i>across the whole engine</i> are equally timed, even with the stock cross-plane crankshaft. If the headers are equal-length, then the exhaust pulses will be equally timed when they reach your ears. And it will sound like a "flat plane" engine.