On any performance forum you look at, regardless of car brand, there are always frequent questions and discussions about performance exhaust and particularly mufflers.

Some folks like louder mufflers, and some like the FloMaster type sound, but it seems more and more people are looking for quieter mufflers that still perform well.

With all the brands available, and at a wide range of prices, it’s hard to know what to buy even after you decide what type of sound you want and how loud you like your exhaust.

I’ve recently run across some interesting links that may help you decide.



The first is a dyno test of quite a number of the popular Mustang performance mufflers all tested on the same street performance Mustang with probably a typical street performance engine combination. They also checked the decibel readings. This should be a pretty comprehensive test as they’re all run on the same car, and it is a “real world” test on a typical


AFM - American Rumble

Here’s an interesting clip of a actual sound bites from a lot of different exhaust/ muffler/engine combinations which, although not obviously all done on the same car and therefore isn’t as good of a comparison, gives at least somewhat of an idea of what type of sound you might expect from different setups.

Mustang Exhaust Clips

It seems the Dynomax Super Turbos are one of the most popular quiet performance mufflers for those that want a relatively quiet muffler for everyday driving and who don’t want the Flowmaster sound. I’ve also read that the Dynomax Hemi Turbos are even quieter and also are at or near the top of the list for performance. They’re actually designed more for heavy duty applications like light trucks and motor homes so that is probably why they’re so quiet, but they reportedly perform as well as the similarly designed but marginally louder regular Super Turbos. They’re also quite very competitively priced.

JEGS High Performance - Dynomax Hemi Super Turbo Mufflers

I adapted a low miles 2-1/2” Mustang Dynomax catback system with the Super Turbos to mine from a wrecked Mustang. It’s not at all annoyingly loud yet sounds nice when you step on it. They do drone inside the car enough to be annoying between 1500 and 2000, even with the noise shields I built for over the top of the mufflers. I’ve read that having equal sized and length pipes all the way back and especially equal sized/length and the exact same mufflers on both sides can be major contributing cause of droning, so I’ve been thinking of changing out just one of the mufflers for i.e. a different length of the same Super Turbo type, or even going to a different brand of the same style like using one Hemi Turbo.

An excellent source for any performance information on small block Ford drive trains is the various Mustang performance forums. There are many knowledgeable folks that contribute to those, and the Mustang crowd is, of course, quite performance oriented. Most of them don’t have the extensive Tech library that our forum does, so the best way to find information on any particular subject is to log onto the appropriate sub-Forum, then do a Search. See the Tech article on Performance Information Links for a listing.