03-18-2021, 05:42 PM | #1 |
Drives: 2013 Chevy Camaro ZL1 Join Date: Feb 2021
Location: South Florida
Posts: 43
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Long Tube Headers + Stock Catalytic Converters
Hi all,
I'm interested in purchasing a set of long tube headers for my 2013 ZL1 6M. They would be 1 7/8, from speed engineering. The issue is that I don't want a lot more sound, I'd like to keep the sound low, and to fix that, I'm hoping to stick with stock catalytic converters. I'm looking to get the power gains from the headers, but the loudness staying the same. Has anyone done this with long tube headers? Is this possible? If it is, let me know how you did it (pics would be nice too ). Thanks, Drew |
03-18-2021, 08:07 PM | #2 |
Drives: 2014 ZL1 Join Date: Jun 2009
Location: Tucson, AZ
Posts: 316
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You're going to spend more money in fab work cutting and welding the the stock cats rather than just buying aftermarket cats that are plug 'n play with the long tubes. Plus you won't gain much power putting them back on because they are so restrictive.
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2014 ZL1 M6: Roto Fab Intake, LS3 TB, Long Tube Headers, NPP, Mild 2 Wild, JMS BAP, SMG aux pump, ID 1050X Injectors, DSX Flex Fuel Sensor, 10.5" DSX Lower Pulley, Killer Chiller, Tuned by Ted at JRE, Pedders XA Extreme coilovers, Mickey Thompson Street S/S on Weld S71s
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03-18-2021, 10:12 PM | #3 |
Drives: HHR Join Date: Dec 2015
Location: GTA ON CA
Posts: 451
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Most go with hi-flow cats in your situation. They flow better and sound better without the rasp of going catless.
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03-19-2021, 08:13 AM | #4 |
Drives: ZL1, 2013, tri-coat-red, manual Join Date: Nov 2013
Location: Michigan
Posts: 1,607
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You will only notice loudness when you cold start and when you go wot as the NPP will keep the stock sound till it opens and bi passes. The stock cats are the most restrictive part of the exhaust system, besides all the remanufacturing required and cost for that as mentioned in the thread.
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03-21-2021, 07:22 PM | #5 |
Drives: 2013 Chevy Camaro ZL1 Join Date: Feb 2021
Location: South Florida
Posts: 43
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Noted- thanks for the input.
I believe the setup I'm going to go with is as follows: Speed Engineering 1 7/8 LTH, & 3 inch ZZPerformance 400 cell catalytic converters. They also claim to be "high flow" but I'm not sure how accurate that is. Does anyone know of any direct bolt on high flow cats to the speed engineering headers? 3 inch + 400 cell would be preferred. Thanks, Drew |
03-21-2021, 10:25 PM | #6 | |
Drives: 2015 2SS A6 Commemorative Edition Join Date: Nov 2019
Location: Utah
Posts: 433
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Quote:
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03-22-2021, 03:27 PM | #7 | |
Drives: 2013 Chevy Camaro ZL1 Join Date: Feb 2021
Location: South Florida
Posts: 43
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Quote:
Thanks, Drew |
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03-24-2021, 03:35 PM | #8 |
Drives: 2012 ZL1 Ashen Grey Join Date: Apr 2017
Location: NW Indiana
Posts: 378
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Maybe a Honda Accord is more what your looking for..... nice a quiet but yet peppy...... but really the power your gonna get is minimal from exhaust. The responsiveness is what you’ll notice a little more..... the sound is why I believe many do exhaust mods. Opens the car up. Breath better!! .
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2012 M6
Kooks 1 7/8, off road pipes , full corsa exhaust ID1300s/ 22% lower / 2.5 upper, JLT CAI, DSX flex fuel, DSX AUX fuel pump. S19 cam Tuned and built by Speed Inc 635/632-93 octane 725/738-E85 |
03-26-2021, 11:40 PM | #9 | |
Drives: 2013 Chevy Camaro ZL1 Join Date: Feb 2021
Location: South Florida
Posts: 43
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Quote:
I still live with my old man so he doesn't like a lot of noise. It would be obnoxiously loud if I had the option. |
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03-27-2021, 12:38 AM | #10 |
Drives: 2012 ZL1 Ashen Grey Join Date: Apr 2017
Location: NW Indiana
Posts: 378
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Well..... spend money on getting your own place!! U over 18 and out of school? Priorities... then build your car. But trust me when I was young my priorities were cars and girls... hahah.
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2012 M6
Kooks 1 7/8, off road pipes , full corsa exhaust ID1300s/ 22% lower / 2.5 upper, JLT CAI, DSX flex fuel, DSX AUX fuel pump. S19 cam Tuned and built by Speed Inc 635/632-93 octane 725/738-E85 |
03-31-2021, 01:40 PM | #11 |
Drives: ZL1 Join Date: Oct 2012
Location: Talladega
Posts: 631
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I really think you will be very pleased with the American Racing Headers Quad Axle Back mufflers, they flow with no restrictions on high horsepower engines and have a very quiet deep mellow tone until wide open throttle with very minimal drone. They are not loud with cats deleted.
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