Dynomax VT Mufflers
Team Owner
Joined: Aug 2005
Posts: 34,988
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From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
That thing looks cool
They have a cat-back system but what I dont like is the muffler looks OEM with LT1 tips
http://dynomax.com/assets/instructio...nstRev0808.pdf
They have a cat-back system but what I dont like is the muffler looks OEM with LT1 tips
http://dynomax.com/assets/instructio...nstRev0808.pdf
Last edited by PLRX; Apr 25, 2010 at 10:12 AM.
Safety Car
Joined: Aug 2008
Posts: 4,344
Likes: 48
From: San Marcos CA
These might work. The muffler guy down the street who does good work says he can piece together some standard quiet turbos with LT1 tips, but I was going to inquire to see if he would be willing to try these on my car when I replace my borla clone drone specials.
Safety Car
Joined: Aug 2008
Posts: 4,344
Likes: 48
From: San Marcos CA
I fear it may still drone at some engine loads and exhaust volumes...or maybe not.
My last mistsubishi car had a flapper valve in the exhaust. quiet enough inside the car..although people did report that it sounded loud for a stock car. I'm interested to try it on a C4.
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
http://dynomax.com/mufflers.php?muffler=vt
I would like to see how the outlet dual tip looks like.
Instructor
Joined: Nov 2009
Posts: 124
Likes: 2
My interest is definately peaked. I'd like to find out the price for the mufflers only. Looks like parts numbers 17690 and 17689. The instruction picture looks like LT1 style tips and it's bare metal. I think I'll get the local guy to check the price. Does anyone know of an on line dealer for dynomax?
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Drifting
Joined: Oct 2005
Posts: 1,923
Likes: 51
From: Angier nc
I would like to hear it as well.I am more interested in it for my BB Dodge.I won't be removing the Corsa anytime soon.
Kind of like the C6 exhaust.Tame until you hit a certain rpm and then full flow and banshee wail.
Kind of like the C6 exhaust.Tame until you hit a certain rpm and then full flow and banshee wail.
Safety Car
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
This is good stuff for us because the only way us C4 owners can get a drone free ride is with the expensive corsa system...This looks like it could bolt up nicely into the stock muffler location, but I am a little concerned with the mechanism...
They probably did tests and research so there hopefully isnt anything to worry about!
Instructor
Joined: Nov 2009
Posts: 124
Likes: 2
What part number are you using to order them? In the install instructions they show 17690 and 17689 for each muffler. When I phoned my local Midas muffler shop the girl looked up the number and said $420 each! That can't be right.
Safety Car
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
Instructor
Joined: Nov 2009
Posts: 124
Likes: 2
I emailed the tech line and was told there is no direct replacement with a tip, only a universal muffler that you customize into your system. Also when you look at the cutaway it is a straight through muffler, not chambered, and only 1/2 a muffler at that because the flapper portion takes up 1/2 the muffler. I suspect the sound under throttle will be loud and won't have a very nice "note".
Le Mans Master
Joined: Apr 2005
Posts: 6,413
Likes: 9
From: The Old Dominion
It doesn't look that revolutionary. Something like the C6 exhaust has a complete muffler path on one side, and a straight pipe on the other with a valve. When the valve is closed, all the exhaust goes through the complete muffler. And when open, it almost all goes straight out. And of course the valve is not operated by backpressure.
This is only 1/2 a muffler, and a valve that is always open some. So the exhaust always travels the same path regardless. It also seems to ensure there is always backpressure greater than the spring pressure, which is not like a straight-through system at all.
Thread Starter
Advanced
Joined: Feb 2010
Posts: 60
Likes: 0
Ordered them from Jegs
Last edited by Stroked383; Apr 27, 2010 at 12:19 PM.
Thread Starter
Advanced
Joined: Feb 2010
Posts: 60
Likes: 0
Mufflers were installed and I wish I had better news to report. They did not work for my application.
The 383 motor combined with the cam is causing the valve inside the muffler to open and close very frequently. The sound is no where near ideal (sounds like two spoons clanging together).
It may work much better for stock cars, however, anyone with a higher performance motor may suffer from the same problem I did.
Have since welded the valves in the open position; it is loud but haven't had a chance to test drive for drone.
The 383 motor combined with the cam is causing the valve inside the muffler to open and close very frequently. The sound is no where near ideal (sounds like two spoons clanging together).
It may work much better for stock cars, however, anyone with a higher performance motor may suffer from the same problem I did.
Have since welded the valves in the open position; it is loud but haven't had a chance to test drive for drone.
Safety Car
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
Mufflers were installed and I wish I had better news to report. They did not work for my application.
The 383 motor combined with the cam is causing the valve inside the muffler to open and close very frequently. The sound is no where near ideal (sounds like two spoons clanging together).
It may work much better for stock cars, however, anyone with a higher performance motor may suffer from the same problem I did.
Have since welded the valves in the open position; it is loud but haven't had a chance to test drive for drone.
The 383 motor combined with the cam is causing the valve inside the muffler to open and close very frequently. The sound is no where near ideal (sounds like two spoons clanging together).
It may work much better for stock cars, however, anyone with a higher performance motor may suffer from the same problem I did.
Have since welded the valves in the open position; it is loud but haven't had a chance to test drive for drone.
you should email the company and tell them about your experience. Maybe they will do something for you, like replace the muffler with another one...I didnt even think about the lope of a cam causing a problem... Hmmm!