Sound, What Sound!
Thread Starter
Cruising
Joined: Aug 2018
Posts: 10
Likes: 0
Sound, What Sound!
This is my 1st post on Corvette Forum, so please bear with me.
I had a 2013 Grand Sport Coupe / manual with the Mild To Wild exhaust option. I removed the fuse and the car had nice rumble at idle, a very aggressive sound through acceleration and downshifting produced a significant amount of "backtalk" through the exhausts.
Today, I have a 2017 Grand Sport Coupe / manual with NPP. My suspension is set to Sport and the exhaust is set to Track however; the fuse is removed.
Sadly, the exhaust tone is nowhere near that of the '13 at idle or during acceleration, and there is virtually no "backtalk" during downshifting.
I have looked at after market exhausts but am inclined to simply remove the mufflers and NPP valves and just run pipes from the cats, back.
I would appreciate any suggestions on that mod or how to get both up and down shift sounds to be more aggressive?
Thanks
Thanks
I had a 2013 Grand Sport Coupe / manual with the Mild To Wild exhaust option. I removed the fuse and the car had nice rumble at idle, a very aggressive sound through acceleration and downshifting produced a significant amount of "backtalk" through the exhausts.
Today, I have a 2017 Grand Sport Coupe / manual with NPP. My suspension is set to Sport and the exhaust is set to Track however; the fuse is removed.
Sadly, the exhaust tone is nowhere near that of the '13 at idle or during acceleration, and there is virtually no "backtalk" during downshifting.
I have looked at after market exhausts but am inclined to simply remove the mufflers and NPP valves and just run pipes from the cats, back.
I would appreciate any suggestions on that mod or how to get both up and down shift sounds to be more aggressive?
Thanks
Thanks
Racer
Joined: Oct 2016
Posts: 307
Likes: 105
I did this exact thing today. Took it to an exhaust shop and had him sawzall the pipes right at the mufflers. He then bent a 3" pipe for each side into the corsa tips I bought. I also installed a corsa x pipe a week ago. Now the car sounds like it should. I'm going to weld a piece to the muffler so I can slip them back on if needed. Total cost was $200 in labor plus the $350 for the corsa tips. Well worth it for the way it sounds now.
Thread Starter
Cruising
Joined: Aug 2018
Posts: 10
Likes: 0
I did this exact thing today. Took it to an exhaust shop and had him sawzall the pipes right at the mufflers. He then bent a 3" pipe for each side into the corsa tips I bought. I also installed a corsa x pipe a week ago. Now the car sounds like it should. I'm going to weld a piece to the muffler so I can slip them back on if needed. Total cost was $200 in labor plus the $350 for the corsa tips. Well worth it for the way it sounds now.
If you don't mind, plz email me at corvettesanonymous@gmail.com
Thanks
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA
I did this exact thing today. Took it to an exhaust shop and had him sawzall the pipes right at the mufflers. He then bent a 3" pipe for each side into the corsa tips I bought. I also installed a corsa x pipe a week ago. Now the car sounds like it should. I'm going to weld a piece to the muffler so I can slip them back on if needed. Total cost was $200 in labor plus the $350 for the corsa tips. Well worth it for the way it sounds now.
OP , most go with the Borla X pipe which removes the second set of cats , its a 1 hour bolt in swap , I can assure you that if you install the X pipe and turn off AFM, the C7 is just as loud as the C6 and will burble on downshift just like the C6 , the one thing it does not do, that the C6 was terrible with, is DRONE at high speeds when the mufflers are open
A C7 just does not sound loud from the drivers seat because of the active noise reduction that the C7 has using the cars sound system
Have someone else drive your car while you stand out side and listen to it as it goes by you , you will see what mean , its not as quiet as you think it is ….
When I first got mine , my kids would say " we heard you turning into the subdivision …. " to me I did not hear a thing ….
( I had a C6 with headers X pipe and NPP so I know the sound you are looking for , its there , you just can hear it from the driver seat )
Dave
Last edited by Dcasole; Aug 18, 2018 at 10:47 PM.
Drifting
Joined: Jan 2005
Posts: 1,441
Likes: 557
Adding a Borla X pipe will wake up your exhaust. It’s a nice bit extra rumble and pop. As stated, the sound deading is much better in the C7. I found with the Borla X it was still to quiet in the **** pit for my taste but perfect for my wife. When following my wife driving her C7 with NPP and Borla X, I realize it’s much louder out back then the **** pit makes it seem. I have now deleted my mufflers and have a Borla X on my Grandsport. It’s magical! I love it. Short clip at idle. Very loud at full tilt.
Last edited by rb185afm; Aug 18, 2018 at 11:24 PM.
Thread Starter
Cruising
Joined: Aug 2018
Posts: 10
Likes: 0
Adding a Borla X pipe will wake up your exhaust. It’s a nice bit extra rumble and pop. As stated, the sound deading is much better in the C7. I found with the Borla X it was still to quiet in the **** pit for my taste but perfect for my wife. When following my wife driving her C7 with NPP and Borla X, I realize it’s much louder out back then the **** pit makes it seem. I have now deleted my mufflers and have a Borla X on my Grandsport. It’s magical! I love it. Short clip at idle. Very loud at full tilt.
https://m.youtube.com/watch?v=8Jb0fH-cmvo
https://m.youtube.com/watch?v=8Jb0fH-cmvo
Thank you to everyone who responded. I spent about 40 minutes on the phone with a Borla Tech and ended with the belief that I just "can't get there from here" without a whole new system - minus headers. He recommended X-pipe + ATAK-S with a cost +/- $2500 + installation which is another +/- $500. That said, I'd now be looking at a +/-$3000 system + the $1500 for the stock w NPP that I would be discarding. Ergonomically, that makes no sense to me. 
I've investigated cut-outs and find a real mixed bag. At this point, I'm seriously thinking of going the 'muffler delete' route and very much appreciate the above video. Further up poughkeepsie stated he had done that at a very reasonable cost ~ although the X-pipe may still be in the equation.
I also appreciate the comments on the C7 sound deadening feature. UGH! Wonder if Ferrari has that?
I had a '70 Coupe with unmuffled side pipes that exited just behind the doors. My thinking is that this GS with muffler delete should sound really good, be Louder inside, but still not as loud in side as the 70 was.
Thanks again!
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,820
From: Charlotte, NC (formerly Endicott, NY)
This is my 1st post on Corvette Forum, so please bear with me.
I had a 2013 Grand Sport Coupe / manual with the Mild To Wild exhaust option. I removed the fuse and the car had nice rumble at idle, a very aggressive sound through acceleration and downshifting produced a significant amount of "backtalk" through the exhausts.
Today, I have a 2017 Grand Sport Coupe / manual with NPP. My suspension is set to Sport and the exhaust is set to Track however; the fuse is removed.
Sadly, the exhaust tone is nowhere near that of the '13 at idle or during acceleration, and there is virtually no "backtalk" during downshifting.
I have looked at after market exhausts but am inclined to simply remove the mufflers and NPP valves and just run pipes from the cats, back.
I would appreciate any suggestions on that mod or how to get both up and down shift sounds to be more aggressive?
Thanks
Thanks
I had a 2013 Grand Sport Coupe / manual with the Mild To Wild exhaust option. I removed the fuse and the car had nice rumble at idle, a very aggressive sound through acceleration and downshifting produced a significant amount of "backtalk" through the exhausts.
Today, I have a 2017 Grand Sport Coupe / manual with NPP. My suspension is set to Sport and the exhaust is set to Track however; the fuse is removed.
Sadly, the exhaust tone is nowhere near that of the '13 at idle or during acceleration, and there is virtually no "backtalk" during downshifting.
I have looked at after market exhausts but am inclined to simply remove the mufflers and NPP valves and just run pipes from the cats, back.
I would appreciate any suggestions on that mod or how to get both up and down shift sounds to be more aggressive?
Thanks
Thanks
Bill
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Thread Starter
Cruising
Joined: Aug 2018
Posts: 10
Likes: 0
Removing the fuse basically leaves you in track mode all the time. On M7 cars with the exhaust set in Track Mode the only time the exhaust valves close is when the the engine switches to V4 operation in Eco Mode. If you don't drive in Eco Mode then you really don't need to pull the fuse.
Bill
Bill
Le Mans Master
Joined: Dec 2003
Posts: 7,457
Likes: 144
From: NC
I read they did a change regarding AFM valves and 2017 and up M7’S but is that just for the Z51’s and GS Cars? In other words does a manual 2017 non GS and non Z51 have the AFM valves? Anyone know without a doubt?