Originally Posted by kanetrain
Well of course they aren't "aftermarket", but it's still the camshaft's lobes making the "lope" correct? I know they dump fuel into it, as well, but it's the lobes that are making the sound?? I may be wrong, I'm curious.
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Incorrect. The sound of a car "loping" is due to the grind of the camshaft and the LSA of that camshaft. On a stock grind the idle will be smooth, such as if you remove the "ghost tune" from the car. All it's doing is tricking the car into dumping excess fuel, adjusting the timing and the lift electronically to simulate the cam lope.