Dual Exhaust Crossover Pipe

Over a year ago I had a local muffler shop install a new dual exhaust, including Dynamax mufflers. And they did a great, clean installation.

It is claimed by many that a dual exhaust increases horsepower (or at least overall performance) by reducing backpressure.

Not sure if that's actually a correct assumption and, frankly, I did not notice any difference as far as performance was concerned.

If a dual exhaust does help performance, that is great, but a true dual exhaust can also create other less-desirable issues, as I was going to find out.

Enter Exhaust Wavelength Resonating Frequencies, and you can end up with an annoying drone as it happened in my case.