Newbie exhaust question

XAUSTD · 09-13-2020, 06:28 PM

Just picked up a white '18 ZL1 6mt. Had just under 10k on it and only mods were LED sidemarkers and a Roto-fab intake. Interestingly enough it was sold as Chevy certified even with the intake. I wasn't going to question that, lol.

Does an axle back system get rid of that nasty crimp in the factory piping or do you need to do a cat back? Thanks for the help!

Edit: Since I have your attention. Does removing the bowtie on the trunk leave a clean look. Meaning, is there an indentation stamped into the trunk for the bowtie or anything?

PROMETHEUS · 09-13-2020, 06:30 PM

There are a number of aftermarket systems, both axle and catback that give you that option.

XAUSTD · 09-13-2020, 06:35 PM

Ok, thanks. Damn you are in Fredericksburg. I grew up in Northern VA and went to Mary Washington College (before it be came a "university") lol

impulse · 09-13-2020, 07:03 PM

I wish I lived in Flordia. Welcome to the club

SJFGTO · 09-13-2020, 07:04 PM

FWIW, the crimp looks worse than it actually is. The crimp is not a bottleneck on the stock exhaust system.

gtfoxy · 09-13-2020, 07:07 PM

Quote:

Originally Posted by impulse

I wish I lived in Flordia. Welcome to the club

Welcome & congrats!

My plan is to drop my exhaust & weld in a non-crimped pipe & leave the rest until I get an S-Type again. I actually like the sound of the stock NPP in track mode for everyday use. I’m sure I’ll get tired of it & want the slightly deeper tone., but for now less than $100 including piping & V-bands I’ll be happy.

gtfoxy · 09-13-2020, 07:09 PM

Quote:

Originally Posted by SJFGTO

FWIW, the crimp looks worse than it actually is. The crimp is not a bottleneck on the stock exhaust system.

Didn’t Jannetti just post the other day they make a tad more HP without the crimp pipe? The sheer esthetics alone make my OCD peg the Oh hell no meter.

XAUSTD · 09-13-2020, 08:38 PM

I like your idea about replacing that section.

Somewhat reminds me of when I had a VW with the VR6. The cheap way to a great sounding exhaust was to have the mid muffler cut out and replaced with a section of pipe.

CW3SF · 09-14-2020, 08:27 AM

That crimped section bugged me to no end. When installing my AWE axleback I saw up close just how crimped it really is. On a supercharged car it HAS to be a restriction. I followed up by ordering and installing AWEs midpipe conversion kit to get rid the crimped section. It was worth every penny to my sanity.

*Someone did some dyno pulls on a Non-Supercharged SS Camaro and didn’t see a difference with the crimp removed. That has led people to post on here that there’s no difference. A Supercharged car is not the same thing. Our ZL1s are moving a lot more air than an N/A car.

LT4Greg · 09-14-2020, 09:53 AM

Hooker headers/Holley offers a Hooker Blackheart delete kit for the crimped section of the exhaust for around $150 that bolts in after cutting the crimped section out with clamps. I was thinking about that kit but not yet decided on it because I do want to keep the NPP exhaust on my Z.

avalonandl · 09-14-2020, 10:21 AM

The short crimped section is deceptive. You can leave it and there will be NO HP loss....

Walkure · 09-14-2020, 10:31 AM

Quote:

Originally Posted by XAUSTD

Edit: Since I have your attention. Does removing the bowtie on the trunk leave a clean look. Meaning, is there an indentation stamped into the trunk for the bowtie or anything?

No indentation, it's just a regular emblem stuck to the paint. There are some pics here from when I replaced my rear emblem.
https://www.camaro6.com/forums/showthread.php?t=576216

CW3SF · 09-14-2020, 02:23 PM

Quote:

Originally Posted by avalonandl

The short crimped section is deceptive. You can leave it and there will be NO HP loss....

Maybe on an SS. The Supercharged ZL1 engine moves a lot more air. People remove cats from supercharged cars for a reason. Same concept with the crimp.

*radz28* · 09-14-2020, 03:26 PM

CSP performed dyno tests on about about their 800-RWHP between a completely stock cat' back (2" LTs, no cats to the OEM-catback) and AFE's 3-inch NPP-style catback. It pretty much picked-up ZERO power (it was within the differences in back-to-back dyno' runs with no changes to the set-up). He did show it seemed to be a restriction when you venture beyond that power level, but unless you're making more power than that, or you just want more sound or different tips, you'd probably be better off putting that money elsewhere if you're looking for power.

To each their own, though...

09-13-2020, 06:28 PM	#1
XAUSTD Drives: ‘18 Camaro ZL1, ‘16 F150 S/C Coyote Join Date: Sep 2020 Location: Central FL Posts: 33	Newbie exhaust question Just picked up a white '18 ZL1 6mt. Had just under 10k on it and only mods were LED sidemarkers and a Roto-fab intake. Interestingly enough it was sold as Chevy certified even with the intake. I wasn't going to question that, lol. Does an axle back system get rid of that nasty crimp in the factory piping or do you need to do a cat back? Thanks for the help! Edit: Since I have your attention. Does removing the bowtie on the trunk leave a clean look. Meaning, is there an indentation stamped into the trunk for the bowtie or anything? Last edited by XAUSTD; 09-13-2020 at 06:30 PM. Reason: added info

09-13-2020, 07:03 PM	#4
impulse Drives: Big Dually ... RIP ZL1 Join Date: May 2020 Location: Nearest (diesel) station Posts: 218	I wish I lived in Flordia. Welcome to the club __________________ Imagine impulsively buying a Summit ZL1.

09-13-2020, 07:04 PM	#5
SJFGTO Oh Oh it's Friday Night! Drives: 2018 ZL1 1LE Nightfall Gray Join Date: Jan 2018 Location: Walton Woods Posts: 1,061	FWIW, the crimp looks worse than it actually is. The crimp is not a bottleneck on the stock exhaust system. __________________ 2018 Camaro ZL1 1LE NFG; ARH 2” headers, catless mids, ARH full exhaust, Lingenfelter 18% lower pulley, ATI Harmonic Balancer, Roto-fab CAI, EE-catch can, TM ported TB, NX Lid, BMR strut tower brace. Aeroforce dual pod interceptor gauges. Tuned by Vengeance Racing!!! 644 HP @ 6250 rpm / 689 trq @ 3660 rpm Four that wanna own me Two that wanna stone me One says she's a friend of mine...

09-14-2020, 09:53 AM	#10
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,813	Hooker headers/Holley offers a Hooker Blackheart delete kit for the crimped section of the exhaust for around $150 that bolts in after cutting the crimped section out with clamps. I was thinking about that kit but not yet decided on it because I do want to keep the NPP exhaust on my Z. __________________ ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.

09-14-2020, 10:21 AM	#11
avalonandl Drives: 2019 ZL-1 Join Date: Feb 2009 Location: Troy, MI & Naples, FL Posts: 2,019	The short crimped section is deceptive. You can leave it and there will be NO HP loss.... __________________ 2019 ZL-1 Acquired 4/23/21 at 6300 miles. Riverside Blue, A10, PDR. Traded in 2017 2SS with 6M and 32k miles. Continental Extreme Contact Sports. Now has 10,000 miles... 2012 Yukon XL Denali w/ 6.2 AWD

09-13-2020, 06:30 PM	#2
PROMETHEUS Drives: 2019 ZL-1, Shadow Gray, Sold Join Date: Jan 2019 Location: Fredericksburg, VA Posts: 1,390	There are a number of aftermarket systems, both axle and catback that give you that option.

09-13-2020, 06:35 PM	#3
XAUSTD Drives: ‘18 Camaro ZL1, ‘16 F150 S/C Coyote Join Date: Sep 2020 Location: Central FL Posts: 33	Ok, thanks. Damn you are in Fredericksburg. I grew up in Northern VA and went to Mary Washington College (before it be came a "university") lol

09-13-2020, 08:38 PM	#8
XAUSTD Drives: ‘18 Camaro ZL1, ‘16 F150 S/C Coyote Join Date: Sep 2020 Location: Central FL Posts: 33	I like your idea about replacing that section. Somewhat reminds me of when I had a VW with the VR6. The cheap way to a great sounding exhaust was to have the mid muffler cut out and replaced with a section of pipe.

09-14-2020, 08:27 AM	#9
CW3SF Drives: 2019 Chevy Camaro ZL1 M6 Join Date: Jul 2019 Location: Sea level Posts: 1,252 View My Garage	That crimped section bugged me to no end. When installing my AWE axleback I saw up close just how crimped it really is. On a supercharged car it HAS to be a restriction. I followed up by ordering and installing AWEs midpipe conversion kit to get rid the crimped section. It was worth every penny to my sanity. *Someone did some dyno pulls on a Non-Supercharged SS Camaro and didn’t see a difference with the crimp removed. That has led people to post on here that there’s no difference. A Supercharged car is not the same thing. Our ZL1s are moving a lot more air than an N/A car.

09-14-2020, 03:26 PM	#14
radz28 Petro-sexual Drives: Ultra-Grin Join Date: Oct 2006 Location: Crazy Coast Posts: 15,198 View My Garage	CSP performed dyno tests on about about their 800-RWHP between a completely stock cat' back (2" LTs, no cats to the OEM-catback) and AFE's 3-inch NPP-style catback. It pretty much picked-up ZERO power (it was within the differences in back-to-back dyno' runs with no changes to the set-up). He did show it seemed to be a restriction when you venture beyond that power level, but unless you're making more power than that, or you just want more sound or different tips, you'd probably be better off putting that money elsewhere if you're looking for power. To each their own, though... __________________ '20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs

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