Subjective - Best Exhaust Set up Incl. NPP with no drone

Checkmate1 · 02-27-2019, 11:44 AM

All,

I am trying to find the sweet spot with regard to in cabin sound experience and of course out of the tailpipes.

What is the best exhaust setup (that does not include headers) that gives one an eargasm inside and outside the car that includes the following -

- Stock NPP Axle back
- No Interior Drone

The headers route will most likely void my warranty which is a no go.

Let's discuss.

ST1LE · 02-27-2019, 11:49 AM

I think your only option, and what you're looking for, is to delete the secondary cats by installing an aftermarket mid-pipe like many have done with the Borla 6060(I think). I believe Corsa has one too.

There is a thread on this, retains warranty as secondary cats don't throw a code so no tune needed. Adds sounds, but nothing crazy and no drone has been reported yet.

Good luck!

Checkmate1 · 02-27-2019, 11:54 AM

Quote:

Originally Posted by ST1LE

I think your only option, and what you're looking for, is to delete the secondary cats by installing an aftermarket mid-pipe like many have done with the Borla 6060(I think). I believe Corsa has one too.

There is a thread on this, retains warranty as secondary cats don't throw a code so no tune needed. Adds sounds, but nothing crazy and no drone has been reported yet.

Good luck!

Thanks. Would appreciate a link to the specific model part for the ZL1.

I hope it is worth it.

staples87 · 02-27-2019, 12:19 PM

Quote:

Originally Posted by Checkmate1

All,

I am trying to find the sweet spot with regard to in cabin sound experience and of course out of the tailpipes.

What is the best exhaust setup (that does not include headers) that gives one an eargasm inside and outside the car that includes the following -

- Stock NPP Axle back
- No Interior Drone

The headers route will most likely void my warranty which is a no go.

Let's discuss.

I see you're in Bel Air, as am I. I'll be installing the Borla ATAK Catback (NPP) on my ZL1 second week of March. I'm keeping the secondary cats though. You're more than welcome to hear it to see if it's loud enough for you.

WhyUMad1LE · 02-27-2019, 12:46 PM

Borla and Flowmaster NPPs don't drone w/ valves closed. I like AFE too but don't know what it sounds like in quiet mode.

Removing secondary cats will make the sound more raspy, I wouldn't do it without adding a resonator.

kwav8r · 02-27-2019, 12:52 PM

I ran a Borla 60606 (secondary cat delete w/x-pipe) from stock exhaust to OEM muffler. There was some drone and it was too raspy for me. So, I included the Borla 60608 (resonator) which eliminated the drone and rasp and made the exhaust a little deeper.

Overall, a little louder than stock and a deeper note.

Stealth7 · 02-27-2019, 01:09 PM

Borla S Type--retain primary and secondary cats. Awesome sound, no drone, and keep NPP Valves.

jvandy50 · 02-28-2019, 07:31 AM

Just finished a stainless works catback last night, but didn’t get to drive. It retains valves, but i have no idea about drone yet...I’d venture to guess little to none, but will know soon.

mt.nichols · 02-28-2019, 08:09 AM

Flowmaster American Thunder w/NPP catback here (retained secondary cats). Deep, aggressive tone, slightly louder than stock, no drone even with the fuse pulled at highway speeds. Next step is going to be a secondary cat delete.

Busted43 · 02-28-2019, 12:40 PM

Quote:

Originally Posted by mt.nichols

Flowmaster American Thunder w/NPP catback here (retained secondary cats). Deep, aggressive tone, slightly louder than stock, no drone even with the fuse pulled at highway speeds. Next step is going to be a secondary cat delete.

+1, same system, love it!

ParisTNDude · 02-28-2019, 12:52 PM

Quote:

Originally Posted by jvandy50

Just finished a stainless works catback last night, but didn’t get to drive. It retains valves, but i have no idea about drone yet...I’d venture to guess little to none, but will know soon.

I am buying a low mileage used set of these SW axlebacks with NPP and wondering what they sound like. You probably are eliminating any resonator that might be OEM and the crunched convertible over the axle pipe. I look forward to your experience.

jvandy50 · 02-28-2019, 01:10 PM

Quote:

Originally Posted by ParisTNDude

I am buying a low mileage used set of these SW axlebacks with NPP and wondering what they sound like. You probably are eliminating any resonator that might be OEM and the crunched convertible over the axle pipe. I look forward to your experience.

i only have one little clip testing the valves, I'd had the fuse out for awhile and just wanted to make sure we were completely done before i pulled it off the lift. i will likely make a thread when i can get some more video and experience, but if you want what i have now just lemme know.

drfeelgood · 02-28-2019, 01:30 PM

Quote:

Originally Posted by staples87

I see you're in Bel Air, as am I. I'll be installing the Borla ATAK Catback (NPP) on my ZL1 second week of March. I'm keeping the secondary cats though. You're more than welcome to hear it to see if it's loud enough for you.

Hey Baltimore guys, it's not time for you to come out and play yet... get that car back in the garage until late April

staples87 · 03-01-2019, 12:52 PM

Quote:

Originally Posted by drfeelgood

Hey Baltimore guys, it's not time for you to come out and play yet... get that car back in the garage until late April

Isn't that the TRUTH!

I'm just hoping for a couple 50+ degree days in March, at the very least.

02-27-2019, 11:44 AM	#1
Checkmate1 Drives: Garnet Red / ZL1 1LE Join Date: Apr 2016 Location: Bel Air, MD Posts: 488	Subjective - Best Exhaust Set up Incl. NPP with no drone All, I am trying to find the sweet spot with regard to in cabin sound experience and of course out of the tailpipes. What is the best exhaust setup (that does not include headers) that gives one an eargasm inside and outside the car that includes the following - - Stock NPP Axle back - No Interior Drone The headers route will most likely void my warranty which is a no go. Let's discuss.

02-27-2019, 11:49 AM	#2
ST1LE Drives: E92 BMW M3 Join Date: Oct 2012 Location: Houston Posts: 4,496	I think your only option, and what you're looking for, is to delete the secondary cats by installing an aftermarket mid-pipe like many have done with the Borla 6060(I think). I believe Corsa has one too. There is a thread on this, retains warranty as secondary cats don't throw a code so no tune needed. Adds sounds, but nothing crazy and no drone has been reported yet. Good luck! __________________ SOLD - 2013 1LE - Pat G Spec'd Cam, NPP with 1 7/8" Long Tube Headers with High Flow Cats, Intake w/scoop, Ported Throttle Body, and Apex 1.25" Lowering Springs. J-Rod Built and Matt@FSP Tuned

02-27-2019, 12:46 PM	#5
WhyUMad1LE Drives: 17 SS 1LE Join Date: Dec 2015 Location: Houston Posts: 1,920	Borla and Flowmaster NPPs don't drone w/ valves closed. I like AFE too but don't know what it sounds like in quiet mode. Removing secondary cats will make the sound more raspy, I wouldn't do it without adding a resonator.

02-27-2019, 12:52 PM	#6
kwav8r Flyin NOE Drives: 2018 ZL1 (A10) Join Date: Apr 2017 Location: TX Posts: 949	I ran a Borla 60606 (secondary cat delete w/x-pipe) from stock exhaust to OEM muffler. There was some drone and it was too raspy for me. So, I included the Borla 60608 (resonator) which eliminated the drone and rasp and made the exhaust a little deeper. Overall, a little louder than stock and a deeper note.

02-27-2019, 01:09 PM	#7
Stealth7 Drives: Gen V Viper GTS Join Date: Jan 2018 Location: SoCal Posts: 260	Borla S Type--retain primary and secondary cats. Awesome sound, no drone, and keep NPP Valves.

02-28-2019, 07:31 AM	#8
jvandy50 Drives: 18 ZL1-1LE, 10 JKU Join Date: Jul 2018 Location: AR Posts: 584	Just finished a stainless works catback last night, but didn’t get to drive. It retains valves, but i have no idea about drone yet...I’d venture to guess little to none, but will know soon.

02-28-2019, 08:09 AM	#9
mt.nichols Drives: '19 ZL1 1LE Join Date: Feb 2019 Location: DFW, TX Posts: 127	Flowmaster American Thunder w/NPP catback here (retained secondary cats). Deep, aggressive tone, slightly louder than stock, no drone even with the fuse pulled at highway speeds. Next step is going to be a secondary cat delete.

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