Base muffler mod
Thread Starter
Intermediate
Joined: May 2013
Posts: 32
Likes: 0
From: Manalapan NJ
Base muffler mod
I know that this thread has been around forever but i just recently discovered it. I would like to hear impressions from anyone who did this mod. Still happy with it? Any issues? Would you do it again? I have an 08 vert & would like just a little more rumble. Thanks in advance.
Thread Starter
Intermediate
Joined: May 2013
Posts: 32
Likes: 0
From: Manalapan NJ
[QUOTEd=MH663;1589080151]What mod specifically?[/QUOTE]
Simple mod, no change out, just drill thru outer muffler shell thru both sides of internal pipe with hole saw than cap shell. Supposed to increase volume.
Simple mod, no change out, just drill thru outer muffler shell thru both sides of internal pipe with hole saw than cap shell. Supposed to increase volume.
Melting Slicks
Joined: Sep 2011
Posts: 3,017
Likes: 171
From: Vancouver Island
I know that this thread has been around forever but i just recently discovered it. I would like to hear impressions from anyone who did this mod. Still happy with it? Any issues? Would you do it again? I have an 08 vert & would like just a little more rumble. Thanks in advance.
No.
Yes.
You'll like it. I did 7/8" holes.
Le Mans Master
Joined: Sep 2006
Posts: 9,594
Likes: 959
From: Palm Harbor not far from Sebring Florida
St. Jude Donor '11
Oldtimer
Here is a link to the original post, https://www.corvetteforum.com/forums...ffler-mod.html, you will need to got around page 7 or 8 to see the photos on how it is done.
What I did was drill a hole with a hole saw and of 1 &1/4 inch through the out shell of the muffler near the back. Then I drilled a 1 inch hole through the internal pipe and that is completely through. I then patched the outer shell where I drilled the first hole.
I did this just as a temporary fix until I purchased a set of cat backs. That was a little over 2 years ago. Saved myself a bunch of money.
What I did was drill a hole with a hole saw and of 1 &1/4 inch through the out shell of the muffler near the back. Then I drilled a 1 inch hole through the internal pipe and that is completely through. I then patched the outer shell where I drilled the first hole.
I did this just as a temporary fix until I purchased a set of cat backs. That was a little over 2 years ago. Saved myself a bunch of money.
Advanced
Joined: Jul 2014
Posts: 61
Likes: 1
From: Hampstead, NC
I did the mod on my 2008 coupe, using a one inch hole. It did make a little more sound, but not much. There was some drone when cruising down the highway at 70 mph.
I did not think it sounded "good" (IMHO). Honestly, it reminded me of a car with a hole in the muffler. If I had it to do over, I would skip it and just buy different mufflers.
(I changed mine to a pair of Z06 bimodes)
I did not think it sounded "good" (IMHO). Honestly, it reminded me of a car with a hole in the muffler. If I had it to do over, I would skip it and just buy different mufflers.
(I changed mine to a pair of Z06 bimodes)
Advanced
Joined: Dec 2014
Posts: 82
Likes: 11
From: Florida
did it last week, took about 1/2 hr
probably not as good as NPP, but it's cheap, works, and the stock exhausts are worthless, so if you do not like it, spend the $$ and replace
I also did the 7/8" hole with 1/2" electrical plugs
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Instructor
Joined: Jul 2007
Posts: 140
Likes: 36
From: Northern Indiana
JT,
I did the mod on my 06 vert and it was better than stock, however I did have some drone at highway speeds. I ended up putting on NPP with a controller and it is 1000% better. I'd do the NPP before I took a drill to the stock exhaust.
I did the mod on my 06 vert and it was better than stock, however I did have some drone at highway speeds. I ended up putting on NPP with a controller and it is 1000% better. I'd do the NPP before I took a drill to the stock exhaust.
Thread Starter
Intermediate
Joined: May 2013
Posts: 32
Likes: 0
From: Manalapan NJ
Hey if those mufflers are laying around collecting dust i might take you up on your offer. I wouldn't mind trying them out on my 08 vert without having to drill mine. Do you know if its a simple change out?
Instructor
Joined: Jul 2007
Posts: 140
Likes: 36
From: Northern Indiana
It is waaaaay easier to drill them out than it is to change out a set of mufflers. If you are unhappy with the stock mufflers drill out what you have and see if you like it. Maybe it will work out for you and maybe not. Worst case you wasted about an hour of your life drilling them out (max) and you'll end up buying a new set of aftermarket mufflers anyhow. I drilled mine out (unhappy) and changed to NPP (very happy) on jack stands in my garage without a lift.
Racer
Joined: Feb 2006
Posts: 393
Likes: 72
From: VA
I know that this thread has been around forever but i just recently discovered it. I would like to hear impressions from anyone who did this mod. Still happy with it? Any issues? Would you do it again? I have an 08 vert & would like just a little more rumble. Thanks in advance.
Le Mans Master
Joined: Sep 2006
Posts: 9,594
Likes: 959
From: Palm Harbor not far from Sebring Florida
St. Jude Donor '11
Oldtimer
What size did you start with and what size is the hole now if you don't mind me asking. I did a 1" hole in the inner pipe on mine.
Team Owner
Joined: Mar 2008
Posts: 21,502
Likes: 461
From: Southern Utah
I had the hole saw set already, so I started at 3/4, then liked it, so in typical Corvette Forum fashion, I figured that more would be better. I went to 1", liked it, then to 1 1/2. I love the sound now and 1 1/2 is enough.
