Borla.

I ended up with the Dyno Max Turbos on my convertible Cutlass running a stock 350, manifolds and a 2-1/2” kit to the bumper. I tried the cheaper Borla which I belive are the XS, Magnaflow & Flowmaster and all had a untalerable amount of drone between 30-40MPH.

I’ve had a chance to hear the exhaust of several of the Stielow builds. I think in the older builds he’s used Stainless Works & Borla XR1’s. I was shocked how quite the XR1’s were at idle and at cruising speeds but at WOT they screamed.

I've got Flowmaster Super 44's, with full-length tailpipes, on my 70. They sound tinny, are really loud, have lots of resonance/drone, and the overall sound quality just sucks. I've outgrown the need for racecar sound levels so a pair of 20" Dynomax Super Turbos are probably going on the car, soon.

I want something quiet enough I can carry on a decent conversation with my passenger or enjoy the car's audio system.

Thank you all for your input.
As usual, ask 10 people, you'll get 10 answers. Nothing wrong with that....everyone has different experiences and perceptions and hence, opinions.
I was told almost 50 years ago when I was looking for my first set of home stereo speakers, confounded by the 40 or 50 choices, "you pay your nickel, and you see the show." In other words, you'll won't know how any of these speakers sound in YOUR house until you get them home. That is one of the most universal pieces of advise I have ever been offered.
There is another shop in my area that will cut off my old (new) mufflers & tack on several types to compare. My hope is they have 3 or 4 of the above suggestions.
This time, I will make sure we back the truck outside and check the sound more than at idle.:headspin:

Thanks again for all the suggestions!!

It is not difficult to run the exhaust pipes under the pumpkin of an IRS. This is my '67 Camaro.

Dynomax 17749
 

http://www.pontiacstreetperformance....p/exhaust.html

YW

That is a SWEET setup! But it is more involved (expensive) than I want to put in the truck at this time. But I certainly will keep this type of routing in mind if I take this thing to another level...

Great article! A lot of interesting info.
I have an appointment on the 10th to "audition" the Flowmaster 50's, Dynomax Super turbo, and 1 or 2 others. We'll see what my ears think...

Thanks for the info!

IMHO hard to beat flow master rumble. Adjust pipe size and number of chambers to your liking.

I dropped 13db at idle by going from the traditional straight through 14" case mufflers (think Magnaflow, Borla, Pypes) to the Dynomax Turbos.

There are only so many designs when it comes to mufflers... go for the Turbo style where the exhaust pulses actually have to change directions and add an X-pipe if you want something quieter and liveable.

The bigger/longer the muffler case the quieter they will be... 3" race style mufflers sound cool unless you actually want to drive and enjoy the car!