[m6-lt1]

You cannot get the functionality of changing the exhaust loudness through the menu on a non npp car. It cannot be added after the car was built.

I believe there are aftermarket valved exhaust’s that give you a remote to be able to change the loudness.

Lastly you aren’t going to gain any additional horsepower from changing your mufflers. Those days are long gone where you could change the muffler and gain horsepower. Manufactures these days do a much better job when designing the factory mufflers for pretty much every single car you can buy.

The only way you can add horsepower through a vehicles exhaust system is if you remove the catalytic converter (which I don’t recommend for the 10 hp gain) or going with a long tube header system + a tune for it.