What resonator? There's only a single in/single out cross-flow muffler in the rear of the car (base V6 only. Y87 performance option has single in/dual out), no resonator, at least not stock.

There are a number of replacements for the stock muffler that could produce a louder sound, without removing the muffler completely, making it sound like a farm tractor.

 

What is the difference between resonator and muffler, isn't a Resonator the muffler that makes the exhaust system quiet?
Also, what brands of mufflers make the car sound angry amd pass emissions test in Texas ?

 

Muffler quiets the exhaust. A resonator is used to tune (up or down) remaining resonant frequency peaks, installed after the primary muffler. You can run a resonator alone (example - SLP "loudmouth" catback system), but it will usually be excessively loud. Your car uses a chambered muffler.

Lots of cheap aftermarket mufflers that will make the engine obnoxiously loud. Usually too loud to pass state or local noise limits (not emissions). Also some quality catback systems the will not only sound louder, but will also add a bit of horsepower - which is more important than noise. Magnaflow and Flowmaster catback systems fall into that category. Muffler by itself isn't going to do much for power.

For the ultimate loud exhaust, you install a "cutout" in the existing exhaust intermediate pipe, opening it up for loud, or keeping it closed for not-so-loud. A cutout can be manual, requiring a cap to be removed, or electrically operated from a switch inside the car.

Ignore the ricer revvers.... I've been headed down the highway to the local drag strip in a car capable of producing 800 HP, following a buddy in his pickup with my 28" slicks, nitrous bottles, and a drum of C16 116-octane leaded racing fuel in the bed, and had these clowns rev..... and totally ignored them.

 

So which is better in terms of HP and loudness, Magnaflow or Flowmaster?

 

Hopefully, one of our V6 owners can offer suggestions as to the specifics of what works best for your application. My experience with the V6 is limited.

I know I've seen threads by other V6 owners discussing their exhaust systems, sound and performance. A "search", particularly in the "All Things V6" forum, should turn up these threads.

 

Would recommend SLP loud mouth exhaust, sounds great and easy to install. You will need a saw zaw to cut the factory pipe and a decent socet set to install.