Has anybody tried these, how do they sound? I currently have their Super Turbo and it sounds exactly like the stock muffler. I want a lower tone but very little interior noise. Would a straight through design give me what I want, maybe Edelbrock's RPM series. I don't like the sound of chambered mufflers, would these sound similar. What would give me a lower tone with little interior noise at highway speeds, and sounds strong at WOT? Thanks

 

I've got them. The have a nice rumble but they aren't as loud as other systems. The claim to have a better cfm than others but I wouldn't know the details.
Tim
90RS

 

My brother put one on his 99 firebird TA, it is louder than stock but not by much, it is a very clean sound that makes the car sound like it should have from the factory. If you want a more noise look some where else. Hope this helps yah out.
PS---his et's droped .24 sec with just the muffler.

 

I have a Dynomax Super Turbo cat-back on my '87 IROC and it sounded stock at first too. After a month or 2, it loosened up and now it sounds wonderful. A very deep sound (lower tone) with a nice growl to it. Not annoying on the highway at all, but it gets loud enough to hear it when I open up the throttle.

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Greg Westphal
'87 IROC 305TPI/A4