ZL1 NPP Exhaust Options

Marcedward_907 · 10-03-2018, 02:33 PM

Hello everyone! I'm sure this topic has possibly been talked about but I just thought I'd check and see if anyone had some insight.

Trying to see if anyone has any experience or hear some input with aftermarket exhausts for the Gen6 ZL1. Primarily any that still retain the NPP functionality.

The OEM NPP exhaust sounds great, but honestly the look of the "suitcase" muffler underneath is to be desired.. Don't get me wrong, GM did a great job with the NPP exhaust tech and all, but it is not very pretty considering all the other aspects of the car.

I love the sound of the OEM NPP, and I actually like that when putting the exhaust in Tour/Stealth mode the exhaust actually quiets down to a very tame level and when in track in basically is a straight piped setup.

Hearing some aftermarket exhausts that remove NPP functionality sound AWESOME, but I would love to be able to put the car in a quiet mode for quiet scenarios (Parking garages, early morning starts, etc) and still be able to open it up and hear every little bit of V8.

eventually headers will be put on the car, but for now a catback is all I am really wanting to do to the car as this car is plenty fast.

Are there any aftermarket NPP exhausts that offer this kind of variable in sound between "tour/stealth" and Track?

thanks all!

LiqTenExp · 10-03-2018, 02:36 PM

Excellent results withe Borla ZL1 Sport Exhaust w/NPP

https://www.borla.com/products/camar...t__140726.html

It sounded great with no drone with stock setup. Absolutely evil under load with current setup (heads/cam/bigger blower/long tubes/etc). But when you get out of it and cruise it is very civilized and if you are cruising in 6th the NPP shuts a little and the noise is barely worse than just a catback with all those mods.

The NPP w/o all the mods worked great. The NPP with all those mods makes me be able to pull into my driveway without waking up the neighbors late at night

The exhaust made the car sound like I thought it should have from the factory.

Marcedward_907 · 10-03-2018, 02:38 PM

LiqTenExp,

Thank you. I appreciate that insight! That was an exact type of review I was looking for.

wlsmoku · 10-03-2018, 02:53 PM

hooker blackheart is what I have - very deep sound to it, no raspiness, and in stealth mode it is very quiet.

https://www.holley.com/brands/hooker..._mode_exhaust/

this is the one I have specifically:
https://www.holley.com/products/exha.../70401337-RHKR

I couldnt be more pleased with the sound, although I bought mine used and previous owner had headers, no cats and a F1A procharger and he said it was way too loud for his setup

LiqTenExp · 10-03-2018, 03:44 PM

Here is a shot of a quick pull from 2nd, unfortunately without much traction

LiqTenExp · 10-03-2018, 03:52 PM

and one more just pulling out from work:

LiqTenExp · 10-03-2018, 03:58 PM

quick pull in 3rd

LiqTenExp · 10-03-2018, 04:01 PM

Some info about those videos. It is about 10x louder now than stock with this exhaust, lol.

I don't have my mods listed in profile but: Rotofab dry, 103mm Katech, 2.3L magnuson, ported stock heads, cam, all new valvetrain, ati balancer/pulley, ARH LT 1-7/8" out to the borla.

All videos were done in track mode.

Marcedward_907 · 10-03-2018, 04:37 PM

Wlsmoku, thank you. I have read into that exhaust. It looks badass too.

And LiqTenExp, your replies have been a tremendous help!

Marcedward_907 · 10-03-2018, 04:38 PM

Wlsmoku. How quiet is that setup in stealth mode in comparison to the OEM npp?

LiqTenExp · 10-03-2018, 05:05 PM

That is hard to measure at this point, in stealth mode it takes all the harness away, reduces the noise greatly. I would say this setup in NPP stealth sounds as loud as the stock exhaust did in track but tonally like it did in stealth.

Marcedward_907 · 10-03-2018, 06:27 PM

Quote:

Originally Posted by LiqTenExp

That is hard to measure at this point, in stealth mode it takes all the harness away, reduces the noise greatly. I would say this setup in NPP stealth sounds as loud as the stock exhaust did in track but tonally like it did in stealth.

Sweet. That’s good to know!

Rnovrit · 10-03-2018, 08:33 PM

I hated the look of the factory exhaust also. It was just cheap and crappy looking compared to the rest of the beautiful engineering and design on the car. I went with the Borla “s” type cat back. Sounds great and retained the NPP portion. I took it one step further and had the new system and remaining factory sections ceramic coated. My car spends a lot of time up on my lift so I see the underside more often than most people.

Michael2000 · 10-03-2018, 09:54 PM

Quote:

Originally Posted by Marcedward_907

Hello everyone! I'm sure this topic has possibly been talked about but I just thought I'd check and see if anyone had some insight.

Trying to see if anyone has any experience or hear some input with aftermarket exhausts for the Gen6 ZL1. Primarily any that still retain the NPP functionality.

The OEM NPP exhaust sounds great, but honestly the look of the "suitcase" muffler underneath is to be desired.. Don't get me wrong, GM did a great job with the NPP exhaust tech and all, but it is not very pretty considering all the other aspects of the car.

I love the sound of the OEM NPP, and I actually like that when putting the exhaust in Tour/Stealth mode the exhaust actually quiets down to a very tame level and when in track in basically is a straight piped setup.

Hearing some aftermarket exhausts that remove NPP functionality sound AWESOME, but I would love to be able to put the car in a quiet mode for quiet scenarios (Parking garages, early morning starts, etc) and still be able to open it up and hear every little bit of V8.

eventually headers will be put on the car, but for now a catback is all I am really wanting to do to the car as this car is plenty fast.

Are there any aftermarket NPP exhausts that offer this kind of variable in sound between "tour/stealth" and Track?

thanks all!

How about just painting the suitcase muffler flat black to hide it?

10-03-2018, 02:33 PM	#1
Marcedward_907 Drives: 2018 Camaro ZL1 Summit White Join Date: Apr 2018 Location: Ketchikan, AK Posts: 49	ZL1 NPP Exhaust Options Hello everyone! I'm sure this topic has possibly been talked about but I just thought I'd check and see if anyone had some insight. Trying to see if anyone has any experience or hear some input with aftermarket exhausts for the Gen6 ZL1. Primarily any that still retain the NPP functionality. The OEM NPP exhaust sounds great, but honestly the look of the "suitcase" muffler underneath is to be desired.. Don't get me wrong, GM did a great job with the NPP exhaust tech and all, but it is not very pretty considering all the other aspects of the car. I love the sound of the OEM NPP, and I actually like that when putting the exhaust in Tour/Stealth mode the exhaust actually quiets down to a very tame level and when in track in basically is a straight piped setup. Hearing some aftermarket exhausts that remove NPP functionality sound AWESOME, but I would love to be able to put the car in a quiet mode for quiet scenarios (Parking garages, early morning starts, etc) and still be able to open it up and hear every little bit of V8. eventually headers will be put on the car, but for now a catback is all I am really wanting to do to the car as this car is plenty fast. Are there any aftermarket NPP exhausts that offer this kind of variable in sound between "tour/stealth" and Track? thanks all!

10-03-2018, 02:36 PM	#2
LiqTenExp Drives: 2017 ZL1 Join Date: Jan 2017 Location: NJ Posts: 905	Excellent results withe Borla ZL1 Sport Exhaust w/NPP https://www.borla.com/products/camar...t__140726.html It sounded great with no drone with stock setup. Absolutely evil under load with current setup (heads/cam/bigger blower/long tubes/etc). But when you get out of it and cruise it is very civilized and if you are cruising in 6th the NPP shuts a little and the noise is barely worse than just a catback with all those mods. The NPP w/o all the mods worked great. The NPP with all those mods makes me be able to pull into my driveway without waking up the neighbors late at night The exhaust made the car sound like I thought it should have from the factory. __________________ 2017 Camaro ZL1 Coupe M6 (847whp Dynojet on 93)

10-03-2018, 04:01 PM	#8
LiqTenExp Drives: 2017 ZL1 Join Date: Jan 2017 Location: NJ Posts: 905	Some info about those videos. It is about 10x louder now than stock with this exhaust, lol. I don't have my mods listed in profile but: Rotofab dry, 103mm Katech, 2.3L magnuson, ported stock heads, cam, all new valvetrain, ati balancer/pulley, ARH LT 1-7/8" out to the borla. All videos were done in track mode. __________________ 2017 Camaro ZL1 Coupe M6 (847whp Dynojet on 93)

10-03-2018, 05:05 PM	#11
LiqTenExp Drives: 2017 ZL1 Join Date: Jan 2017 Location: NJ Posts: 905	That is hard to measure at this point, in stealth mode it takes all the harness away, reduces the noise greatly. I would say this setup in NPP stealth sounds as loud as the stock exhaust did in track but tonally like it did in stealth. __________________ 2017 Camaro ZL1 Coupe M6 (847whp Dynojet on 93)

10-03-2018, 08:33 PM	#13
Rnovrit Drives: 2018 NFG ZL1-1LE Join Date: Jun 2018 Location: Near the water Posts: 304	I hated the look of the factory exhaust also. It was just cheap and crappy looking compared to the rest of the beautiful engineering and design on the car. I went with the Borla “s” type cat back. Sounds great and retained the NPP portion. I took it one step further and had the new system and remaining factory sections ceramic coated. My car spends a lot of time up on my lift so I see the underside more often than most people. Attached Images

10-03-2018, 02:38 PM	#3
Marcedward_907 Drives: 2018 Camaro ZL1 Summit White Join Date: Apr 2018 Location: Ketchikan, AK Posts: 49	LiqTenExp, Thank you. I appreciate that insight! That was an exact type of review I was looking for.

10-03-2018, 02:53 PM	#4
wlsmoku Drives: 2018 ZL1 A10 Join Date: Mar 2018 Location: Missouri Posts: 133 View My Garage	hooker blackheart is what I have - very deep sound to it, no raspiness, and in stealth mode it is very quiet. https://www.holley.com/brands/hooker..._mode_exhaust/ this is the one I have specifically: https://www.holley.com/products/exha.../70401337-RHKR I couldnt be more pleased with the sound, although I bought mine used and previous owner had headers, no cats and a F1A procharger and he said it was way too loud for his setup

10-03-2018, 04:37 PM	#9
Marcedward_907 Drives: 2018 Camaro ZL1 Summit White Join Date: Apr 2018 Location: Ketchikan, AK Posts: 49	Wlsmoku, thank you. I have read into that exhaust. It looks badass too. And LiqTenExp, your replies have been a tremendous help!

10-03-2018, 04:38 PM	#10
Marcedward_907 Drives: 2018 Camaro ZL1 Summit White Join Date: Apr 2018 Location: Ketchikan, AK Posts: 49	Wlsmoku. How quiet is that setup in stealth mode in comparison to the OEM npp?

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