Muffler Mod Question....
Thread Starter
Racer
Joined: Nov 2007
Posts: 360
Likes: 0
From: Harker Heights Texas
Muffler Mod Question....
Maybe I've missed it in my searches, but when performing the muffler mod, with the flaps CLOSED, does the exhaust note change any? Or is it only when the exhaust flaps are OPEN that the volume is enhanced. I guess I'm just not completely understanding what to expect from this modification.... Any help would be appreciated!
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
If you're talking about the Z06 muffler mod then yes, the only thing the mod affects is the "flaps open" sound/volume because you're closing off the stock perforated pipe inside and making it a solid one, similar to the NPP mufflers. 
Thread Starter
Racer
Joined: Nov 2007
Posts: 360
Likes: 0
From: Harker Heights Texas
I am talking about the ZO6 muffler mod and thank you as that helps me to understand a bit better what I'm considering!
Drifting
Joined: Jul 2005
Posts: 1,272
Likes: 54
From: W. Jefferson OH
I noticed if you leave the packing inside the mufflers then the exhaust note is the same when closed. I removed mine in my 07 and it had a more "hollow sound" when closed.
I had LT's and no cats and it was loud when open!
I had LT's and no cats and it was loud when open!
Thread Starter
Racer
Joined: Nov 2007
Posts: 360
Likes: 0
From: Harker Heights Texas
Also, what is a good price to expect to pay for this mod to be performed? I was quoted a total of $485 to have it done. This seems a bit high to me, but I might be wrong.
Burning Brakes
Joined: Dec 2008
Posts: 849
Likes: 437
From: Saint George, UT
I agree with FrankTank: Slightly louder after the mod.
The price you are quoted seems high to me. I used my Dremel to cut the sheet metal on the outside of the mufflers for access. And, I did the unmounting and mounting on the car myself.
I took the open access mufflers to a welder who made the sleeve from exhaust pipe stock, welded the sleeve, welded the sheet metal, ground the welded area fairly smooth, painted the welded area with high-temp paint for $90.
I guess it depends on how hands-on you want to be.
The price you are quoted seems high to me. I used my Dremel to cut the sheet metal on the outside of the mufflers for access. And, I did the unmounting and mounting on the car myself.
I took the open access mufflers to a welder who made the sleeve from exhaust pipe stock, welded the sleeve, welded the sheet metal, ground the welded area fairly smooth, painted the welded area with high-temp paint for $90.
I guess it depends on how hands-on you want to be.
Le Mans Master
Joined: Dec 2007
Posts: 5,738
Likes: 81
From: Milford NH
"Hollow" or pingy? According to your tastes, would you recommend leaving the packing in or removing it?
Also, what is a good price to expect to pay for this mod to be performed? I was quoted a total of $485 to have it done. This seems a bit high to me, but I might be wrong.
Also, what is a good price to expect to pay for this mod to be performed? I was quoted a total of $485 to have it done. This seems a bit high to me, but I might be wrong.
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