3 Mufflers for a quiet system ?

[pontiac69fb]

I am going to chime in and give my 2 cents. This is a little off topic, but I really enjoyed reading this thread, because the quiet stealthy approach of the grand nationals is a big part of why I fell in love with them. I have seen really loud obnoxious v8 cars run 15's in the quarter then I would, see these Grand Nationals where all I could hear was this whistle?, and they would be running 11s. I thought it was the coolest thing in the world and is a big part of the reason I drive 1 now.

[Pronto]

Loudness isn't an indicator of performance. Sometimes when I'm in the staging lanes I have to look at my scanmaster just to see if my car is running because I can't hear it over some stupidly loud car in the next lane. I got tired of the constant drone and having to have the radio up too loud just to hear it with my old T/A. Quiet acceleration is one of the best things about TBs.

[volvoman]

At turbo thunder IV he was nice enough to let me take some pictures of his set up. I wanted the same thing on my car but it would not fit on mine. Hope this helps out. You can pull the part # from the pictures if you want.
Oh one other thing you can't hear it run at all at the track.
Chris
pictures here

[TEST MY 6]

Thanks for the great pics!!!! I just noted somthing about the 17231 vs the 17276 Besides the 17231 being aluminized its also a 14" muffler rather than the 17276 which is a 20" , I think at this point the extra money is worth it only because it has been used in dennis's car and it simply works. The 17276 is avaiable from summit at 179.95 , If it quiets the car down as people have said than its worth it.

[volvoman]

From what I rember talking to him about it the exhaust comes over the axles and ----><----- against each other at the top and exits down <--- --->at the bottom. You will have to make sure thats what he did, but I think thats why its so nice. One other thing if you are going to do all this and spend the money mights as well be ss. He also said it was a tight run over the rear axles too. Good luck and let us know how it sounds if at all ..
Chris

[TurboBob]

the stock exhaust comes over the axle and enters both bottom ports on the muffler --->|____|<---

Then the exhaust exits thru both top ports <---|___|--->

The "Dennis Hogan" exhaust is "top to top", "bottom to bottom"


--->|_____|--->
<---|_____|<---

So it takes a little more work to make it all fit. Plus that larger muffler is a tight fit. It should be well worth it though.....

Bob

[TEST MY 6]

Yup that's it Bob, and I think that because the 17276 is a Straight thru type muffler there will not be much HP loss at all, The Original GN muffler being a true crossflow relies on the gases to find their way thru the chambers/baffles to the lower exit ports and would cause excessive back pressure especially in a high HP application.

[FBSideoiler427]

If the 17231 and 17276 mufflers are aluminized, does Dynomax have SS versions of the two? If so......part numbers?? Thanks.

[TurboBob]

17276 Stainless, 20" case

17231 Aluminized, 14" case

[Mike Licht]

Bob how did I know you would be in this thread?
Bigger case volume = quieter
Mike

[BLACK DEATH DSR]

I hope this helps your choice. I have a dual 3" system made from an exhaust shop. I had turbo mufflers on it and I didnt like the way it sounded. We cut these out and put straight pipes. It was VERY loud. I just put in 3" Dynomax Ultraflows. Man did it quite the car down that I can actually hear everything else now. Get the Ultraflows or the Magnaflows, they both have the same design. You will not be dissapointed if you get these mufflers unless you want it to be loud. If you want it to be loud, get something else.

[stickybones]

Originally Posted by BLACK DEATH DSR

Get the Ultraflows or the Magnaflows

Quiet is somewhat relative. I'd venture to say that the people on this thread want it even quieter than the ultraflows. I had ultraflows and the aerochambers I have now are even quieter. I still want something even quieter hence the desire for the third "big case" freeflowing muffler in the stock location.

[TEST MY 6]

well I orderd the 17276 but my plans to see the exhaust guy wil have to wait till next saturday due to the rain that hasnt stopped here for like 5 days .

[TurboBob]

I had dual ultraflows, and then switched to aerochambers. I also installed three borla venturis and a flexible test pipe, and I have installed frame braces. All in the name of reducing drone. Still too loud and "droney".

On the 17276, please take a ton of pics! I have a shop that has said they would tackle it, but all available pics would be a great help.

Bob

[TurboBob]

Anyone tried the "tailpipe slots" that were posted a few years ago?

Bob

[TEST MY 6]

The finish is almost chrome like and the design is 2.5" straight thru .

[TurboBob]

excellent

[stickybones]

Pictures of the final product with the axle hump and tail pipes and all fab'd up would be cool too.

[volvoman]

Originally Posted by stickybones

Pictures of the final product with the axle hump and tail pipes and all fab'd up would be cool too.

I know there have been a lot of people wanting a set up just like this and ask for it a lot. If you had Lots of pics of the build and final set up I am sure you could get maybe one of the other sites to post it, if you do a small write up. Also giving credit were needed too.
Chris

[TEST MY 6]

Ill do my best , The exhaust guy im going to see has done some nice stuff from what ive been told and I have seen a dual 3" setup on a late model F-body that he did, He said to me " i hate to sound cocky but I can do anything" LOL well see