Exhaust, post-fact.

USAFS197 · 07-20-2018, 05:02 PM

So, I recently had a round of modifications for my car. Of which, I ended up with catless long tubes, stock mid pipe and Flowmaster NPP axle back. Now, I had a 2014 Camaro SS with 2" catless longtubes, going to the stock mid-pipe and into the stock NPP and it was loud but, not this kind of loud.

My question is, for those of you who have aftermarket, modified or exhaust shop specials, did any of you place a resonator or two in that section and if so, what were the dimensions of the resonator? I need to find a way to quiet this down a bit. Thanks!

AD17SS1LE · 07-20-2018, 07:50 PM

I did not add resonators. My car was much louder with the headers and I love the sound of my exhaust much better than stock. I just use the NPP exhaust tour mode if I don't want piss off the neighbors lol. I do have catted connection pipes but the cats are the size of a can of dip, don't think they tone it down too much.

KingLT1 · 07-20-2018, 08:47 PM

those cats tone it down more then you think...take them off and report back lol.

EMTNLSS · 07-20-2018, 09:55 PM

I have the same exhaust setup except catted. It's loud but I love it. I just put the exhaust on stealth when I want it "quiet". I have a set of catless connection pipes also so now i'm curious to see how big of difference the cats actually make. Maybe i'll switch them out one day when i'm bored haha.

USAFS197 · 07-20-2018, 11:08 PM

Our cars don’t exactly have a stealth mode, per se. I mean, I could put my fuse back in and set the exhaust to touring mode but, the valves will still open up under load. I don’t want to impede my flow, just take the edge off of the harshness. I’m hoping I can get some quality resonators welded into the stock mid pipe location to help out. I just don’t know what’ll fit.

Chef-j · 07-21-2018, 12:04 AM

Resonator wont really help much if you want quiet it down. They are better reduce drone.

Your best bet is add quality high flow catalytic converter or change muffler.

KingLT1 · 07-21-2018, 09:00 AM

Quote:

Originally Posted by USAFS197

Our cars don’t exactly have a stealth mode, per se. I mean, I could put my fuse back in and set the exhaust to touring mode but, the valves will still open up under load. I don’t want to impede my flow, just take the edge off of the harshness. I’m hoping I can get some quality resonators welded into the stock mid pipe location to help out. I just don’t know what’ll fit.

Sure it does...if you set the exhaust mode to Stealth in the infotainment center or Snow/Ice mode, the valves will not open @ WOT.

oldman · 07-21-2018, 12:48 PM

Quote:

Originally Posted by Chef-j

Resonator wont really help much if you want quiet it down. They are better reduce drone.

Your best bet is add quality high flow catalytic converter or change muffler.

I would agree.

USAFS197 · 07-21-2018, 04:59 PM

Quote:

Originally Posted by KingLT1

Sure it does...if you set the exhaust mode to Stealth in the infotainment center or Snow/Ice mode, the valves will not open @ WOT.

Odd. I almost distinctly remember the valves opening up nonetheless; just at different rpms/engine load. I put the fuse back in my exhaust so, we'll see how much that lowers the tone. Also, there are resonators out there that do a fantastic job of reducing volume, such as the Vibrant Ultra Quiet resonator. Only problem is fitment in this regard, since its pretty tight in the mid pipe section of our exhaust so, I don't think that'll fit.

EMTNLSS · 07-21-2018, 05:04 PM

The exhaust valves can be tuned to open and close when you want. Stealth is closed all the time. I have my Track mode tuned to where the valves stay open all the time except in 8th gear so on the freeway drone is reduced. You can tune them to stay open all the time just like if you had your fuse pulled though.

USAFS197 · 07-21-2018, 11:42 PM

So, I put the fuse back in and placed the car into stealth mode, as per the settings. Its quieter but, still very loud. I'll attempt to find my own way to address this without putting cats in. Thanks.

7speed · 07-22-2018, 03:03 PM

Cats would quiet it some but most likely the flowmaster muffs that are loud compared to the stock suitcase.

KingLT1 · 07-22-2018, 07:37 PM

Quote:

Originally Posted by EMTNLSS

The exhaust valves can be tuned to open and close when you want. Stealth is closed all the time. I have my Track mode tuned to where the valves stay open all the time except in 8th gear so on the freeway drone is reduced. You can tune them to stay open all the time just like if you had your fuse pulled though.

What software are you using to access the NPP Valve tuning. I have HPtuners 4.0 and have not found it. Thx

BlueCamaro6 · 07-22-2018, 08:41 PM

Quote:

Originally Posted by KingLT1

What software are you using to access the NPP Valve tuning. I have HPtuners 4.0 and have not found it. Thx

It's in HpTuners as I've adjusted mine - see attached

07-20-2018, 05:02 PM	#1
USAFS197 Drives: 2018 Audi TT RS Join Date: Jan 2014 Location: Navarre, Florida Posts: 1,915	Exhaust, post-fact. So, I recently had a round of modifications for my car. Of which, I ended up with catless long tubes, stock mid pipe and Flowmaster NPP axle back. Now, I had a 2014 Camaro SS with 2" catless longtubes, going to the stock mid-pipe and into the stock NPP and it was loud but, not this kind of loud. My question is, for those of you who have aftermarket, modified or exhaust shop specials, did any of you place a resonator or two in that section and if so, what were the dimensions of the resonator? I need to find a way to quiet this down a bit. Thanks! __________________ 2018 Audi TT ▊RS 2.4X 0-60, 1.6X 60', 120+mph 1/8th, 4.XX 60-130, 150+mph traps on 255/35/18 R888R tires on the street (unprepped). 2019 Audi RS3 About as fast as the TT RS 2019 Camaro ZL1 1LE Sold 2018 Camaro SS 1LE Sold 2019 Corvette Z06 Sold 2021 Charger Hellcat Redeye Widebody Sold

07-20-2018, 07:50 PM	#2
AD17SS1LE Drives: 2017 Camaro SS 1LE Join Date: Jul 2017 Location: Nashville Posts: 85 View My Garage	I did not add resonators. My car was much louder with the headers and I love the sound of my exhaust much better than stock. I just use the NPP exhaust tour mode if I don't want piss off the neighbors lol. I do have catted connection pipes but the cats are the size of a can of dip, don't think they tone it down too much. __________________ 2017 Camaro SS 1LE Pray ported TB/IM TSP 1 7/8 Long tube headers w catted con pipes Taylor plug wires Mishimoto oil cooler Elite X2 catch can

07-20-2018, 08:47 PM	#3
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,800	those cats tone it down more then you think...take them off and report back lol. __________________ 2016 NFG 1SS A8 Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA

07-20-2018, 09:55 PM	#4
EMTNLSS Drives: 2016 Hyper Blue 2SS Join Date: Feb 2016 Location: Layton, UT Posts: 498	I have the same exhaust setup except catted. It's loud but I love it. I just put the exhaust on stealth when I want it "quiet". I have a set of catless connection pipes also so now i'm curious to see how big of difference the cats actually make. Maybe i'll switch them out one day when i'm bored haha. __________________ 2SS Hyper Blue Metallic \| A8 \| Jet Black Interior \| NPP Exhaust Current Mods: Catch Can \| aFe Lowering Springs \| GM 2nd Gen Splitter \| Hotchkis Sway Bars \| MRR FS02 Wheels \| Flowmaster Exhaust \| Dark Tail Lights \| Diode Dynamics Sidemarkers \| Roto Fab \| Solar TB \| PRAY Ported IM \| BMR \| PRAY Tune Upcoming Mods:

07-20-2018, 11:08 PM	#5
USAFS197 Drives: 2018 Audi TT RS Join Date: Jan 2014 Location: Navarre, Florida Posts: 1,915	Our cars don’t exactly have a stealth mode, per se. I mean, I could put my fuse back in and set the exhaust to touring mode but, the valves will still open up under load. I don’t want to impede my flow, just take the edge off of the harshness. I’m hoping I can get some quality resonators welded into the stock mid pipe location to help out. I just don’t know what’ll fit. __________________ 2018 Audi TT ▊RS 2.4X 0-60, 1.6X 60', 120+mph 1/8th, 4.XX 60-130, 150+mph traps on 255/35/18 R888R tires on the street (unprepped). 2019 Audi RS3 About as fast as the TT RS 2019 Camaro ZL1 1LE Sold 2018 Camaro SS 1LE Sold 2019 Corvette Z06 Sold 2021 Charger Hellcat Redeye Widebody Sold

07-21-2018, 12:04 AM	#6
Chef-j Drives: 2018 Camaro 1SS Join Date: Jun 2018 Location: DFW Posts: 422	Resonator wont really help much if you want quiet it down. They are better reduce drone. Your best bet is add quality high flow catalytic converter or change muffler. __________________ 2018 1SS 6MT: SOLD

07-21-2018, 05:04 PM	#10
EMTNLSS Drives: 2016 Hyper Blue 2SS Join Date: Feb 2016 Location: Layton, UT Posts: 498	The exhaust valves can be tuned to open and close when you want. Stealth is closed all the time. I have my Track mode tuned to where the valves stay open all the time except in 8th gear so on the freeway drone is reduced. You can tune them to stay open all the time just like if you had your fuse pulled though. __________________ 2SS Hyper Blue Metallic \| A8 \| Jet Black Interior \| NPP Exhaust Current Mods: Catch Can \| aFe Lowering Springs \| GM 2nd Gen Splitter \| Hotchkis Sway Bars \| MRR FS02 Wheels \| Flowmaster Exhaust \| Dark Tail Lights \| Diode Dynamics Sidemarkers \| Roto Fab \| Solar TB \| PRAY Ported IM \| BMR \| PRAY Tune Upcoming Mods:

07-21-2018, 11:42 PM	#11
USAFS197 Drives: 2018 Audi TT RS Join Date: Jan 2014 Location: Navarre, Florida Posts: 1,915	So, I put the fuse back in and placed the car into stealth mode, as per the settings. Its quieter but, still very loud. I'll attempt to find my own way to address this without putting cats in. Thanks. __________________ 2018 Audi TT ▊RS 2.4X 0-60, 1.6X 60', 120+mph 1/8th, 4.XX 60-130, 150+mph traps on 255/35/18 R888R tires on the street (unprepped). 2019 Audi RS3 About as fast as the TT RS 2019 Camaro ZL1 1LE Sold 2018 Camaro SS 1LE Sold 2019 Corvette Z06 Sold 2021 Charger Hellcat Redeye Widebody Sold

07-22-2018, 03:03 PM	#12
7speed Drives: 21 SS Join Date: Oct 2017 Location: Dallas Posts: 322	Cats would quiet it some but most likely the flowmaster muffs that are loud compared to the stock suitcase. __________________

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