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04-16-2021, 11:05 AM
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#15 | |
 Drives: '18 ZL1 1LE Join Date: May 2020
Location: KY
Posts: 219
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2018 ZL1 1LE - Summit White, PDR, Rotofab CAI, 95mm TB, CSP 2" catless LT's, JMS Voltage Booster, AEM X-series WB, DSX flex fuel sensor, Banks Data Monster, Tuned by Ted Jannetty, 5% Tint, Blackvue DR900S-2CH, Diode Dynamics lighting, IGL Kenzo ceramic coating
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04-16-2021, 11:54 AM
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#16 |
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Geoff
Drives: 2022 SS 1LE Join Date: May 2013
Location: Houston
Posts: 1,773
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OP look at adding a "resonator" in each pipe upstream of the stock muffler. That should knock out the higher frequencies and tone it down. Speculation here, I don't think you'll lose any noticeable power
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04-16-2021, 12:13 PM
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#17 |
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Petro-sexual
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Stealth mode, if I recall, did open (similarly in Tour mode), after a certain RPM. I think the RPM thresholds were slightly different, but using King's method helped me tune the exhaust pretty much exactly how I want it. I still have it open after certain thresholds, but they open slightly more and earlier than stock now.
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 '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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04-16-2021, 12:41 PM
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#18 | |
 Drives: 2019 ZL1 1LE Join Date: Feb 2017
Location: Gilbert, AZ
Posts: 674
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Old: 2017 SS 1LE
Old: 2017 ZL1 Current: 2019 ZL1 1LE |
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04-16-2021, 01:26 PM
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#19 | |
    
Drives: 2019 ZL1 Join Date: Mar 2019
Location: NJ
Posts: 1,537
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In stealth mode, they will still open. I forgot what rpm but its there.
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928rwhp - 93 | 1040rwhp/898rwrq - E65 SAE
LME 377 LT4 Short Block | Magnuson 2650 80mm upper w/13% lower (9.06) | DSX Lid & Valve Covers | CSP Custom Cam w/32% fuel lobe | CID Heads | NW 103mm TB | Roto Fab Big Gulp | CSP 2" Headers w/Green GESI Gen 2 Cats | Borla 3" Full Cat Back w/ S-Type| Mighty Mouse Wild Catch Can| Custom Holley Low side Fuel system| TooHigh PSI Port Injection w/Holley Controller | Forced Inductions Interchiller w/2 gallon fender tank | TK Performance built 10L90 |
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04-16-2021, 02:47 PM
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#20 |
 Drives: 17 SS 1LE Join Date: Dec 2015
Location: Houston
Posts: 1,920
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There was a thread on the Magnaflow resonated x-pipe a few months ago. People seemed to be happy with the results.
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04-16-2021, 04:05 PM
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#21 |
 Drives: ZL1 1LE Join Date: Jul 2020
Location: MA
Posts: 46
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Welp looks like I'm not bringing this car to that track any more... that blows. I don't want to modify the exhaust. The current setup is perfect.
Thanks for the heads up about keeping the exhaust valves closed, figured there might be a backpressure issue (bulged exhaust) or something like that but nothing like the photo posted |
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04-16-2021, 05:23 PM
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#22 | ||
     
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 7,665
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 2016 NFG SS A8/Whipple 2.9/Fuel System/Flex Fuel |
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