07-31-2022, 06:46 PM | #1 |
Drives: '17 Camaro 2SS & '99 Camaro Z28 Join Date: Feb 2014
Location: Austin, TX
Posts: 1,836
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What to do for exhaust?
I'm thinking of purchasing a system for my 2SS, but not sure what to aim for. The car has NPP and I want to leave the NPP functional.
If I upgrade the headers, cats, and X-Pipe but kept the stock NPP mufflers, how much power would I be sacrificing? What is the most ideal way of tackling the entire exhaust for a car with NPP? |
07-31-2022, 07:30 PM | #2 | |
Drives: 2018 Camaro SS Join Date: Aug 2020
Location: MD
Posts: 295
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Quote:
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07-31-2022, 07:30 PM | #3 |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,611
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There isn't any power to be gained from an exhaust unless you are making crazy high numbers.
Out of the "big three" vendors of drone-free, good looking and sounding exhausts, AWE is out because they aren't willing to make valved models, choose Borla for a nice low, non-raspy rumble or Corsa for a classic, more brutal muscle car sound. I'm sure there are others that work and are cheaper, but I personally don't want to mess with resonators and J-pipes to eliminate drone or fine tune the exhaust after spending a ton of money. I for one like the stock NPP even with headers, but one of these days (when I can justify the cost somehow) I'll get me a nice Corsa catback setup.
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune 1100 - 1/30/18 | 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 | 3800 - 2/26/18 4300 - 2/27/18 | 4B00 - 3/01/18 4200 - 3/05/18 | 4800 - 3/14/18 5000 - 3/16/18 | 6000 - 3/19/18 |
07-31-2022, 08:00 PM | #4 |
Drives: 2020 LT1 M6 Join Date: Jan 2016
Location: South, the DEEP south
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OP, Your stock NPP catback has been tested up to 900 rwhp before becoming a restriction. The biggest restriction in the factory exhaust system are the primary catalytic converters and the tiny pipe connecting your factory tri-Y exhaust manifolds to them. After this, the next biggest restriction is your secondary catalytic converters.
If you want to save money and have a 900+ rwhp capable exhaust while retaining NPP functionality, buy and install 2 inch catless long tube headers and have that connected to your factory NPP catback. |
07-31-2022, 08:40 PM | #5 |
Drives: '17 Camaro 2SS & '99 Camaro Z28 Join Date: Feb 2014
Location: Austin, TX
Posts: 1,836
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If thats the case, is it even worth doing headers on these cars?
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07-31-2022, 08:47 PM | #6 |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,751
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Depends on the build and desired HP level. I found the stock manifolds to be fine and didn’t find them to be a restriction until I went past ~650 WHP or so. And even then, it was the primary cats that were really becoming an issue at that point.
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2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
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07-31-2022, 09:33 PM | #7 | |
Drives: '17 Camaro 2SS & '99 Camaro Z28 Join Date: Feb 2014
Location: Austin, TX
Posts: 1,836
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Quote:
If that’s the case, where is there power to be had? If I did do full exhaust and a tune to go with it, along with CAI and a Intake Manifold, would I see worthy improvements? It’s really sounding like the SS is almost maxed out in stock form without getting into the internals. Im out of the loop when it comes to modding 6th Gens. I haven’t been paying much attention because I wasn’t going to touch anything until I paid off my SS but some strain of rare luck happened and I managed to pay it off a few years early. |
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07-31-2022, 10:24 PM | #8 | |
Drives: 2020 LT1 M6 Join Date: Jan 2016
Location: South, the DEEP south
Posts: 1,114
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Quote:
Now if you want more than that, your choices are to either open it up for cam, valvetrain upgrade, and ported heads OR put a better fuel system in it (such as LT4) and slap a blower kit on it. |
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07-31-2022, 10:37 PM | #9 | |
Drives: '17 Camaro 2SS & '99 Camaro Z28 Join Date: Feb 2014
Location: Austin, TX
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07-31-2022, 11:25 PM | #10 |
Drives: 2020 LT1 M6 Join Date: Jan 2016
Location: South, the DEEP south
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The LT1 fuel system is more than capable of handling just about any naturally aspirated modifications. Fuel demands increase much more for forced induction applications and the stock LT1 fuel system can not keep up with the fuel demands for a blower or turbo. The LT4 fuel system allows the LT1 to safely provide enough fuel for low boost. Beyond that, you either need a cam upgrade with a bigger fuel lobe OR a high capacity Direct injection system upgrade OR install a complementary port injection fuel system.
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08-01-2022, 08:57 AM | #11 | |
Drives: E92 BMW M3 Join Date: Oct 2012
Location: Houston
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To me, headers and a tune are a must have on any of my muscle cars. The muffler choice is mostly subjective based on what you like. The stock NPP isnt bad, but raspier than I prefer. I will likely go with Borla S-Type axle-back on my car, but again just because I prefer the cleaner, deeper sound.
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08-01-2022, 09:31 AM | #12 | |
Drives: 2022 camaro 2ss 1LE Join Date: Dec 2021
Location: FL
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08-01-2022, 09:58 AM | #13 |
Drives: 2021 LT1 6spd Join Date: Nov 2020
Location: Arlington, VA
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I went with the Corsa NPP system, has the muscle car sound I was looking for while not being obnoxious or overly raspy
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08-01-2022, 03:08 PM | #14 |
Drives: '17 Camaro 2SS & '99 Camaro Z28 Join Date: Feb 2014
Location: Austin, TX
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