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Old Apr 7, 2022 | 10:19 PM
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What size headers should I go with? 1 7/8” or 2”? I’ve read that the 2” are a very tight fit and they might have to be “dimpled” to fit.
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Old Apr 8, 2022 | 10:24 AM
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Don’t do headers do down pipes and an x pipe.
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Old Apr 8, 2022 | 10:43 AM
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1 7/8 is plenty fine for mild mods. If you plan to up the boost with a pulley change, the 2 inch headers will make more power up top.
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Old Apr 8, 2022 | 02:20 PM
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If you go with ARH or Kooks the 2" will fit no problem. I tried Texas speed first and had nothing but problems getting them to fit. Switched to Kooks and no issues. Otherwise, what Internets_Ninja said...
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Old Apr 8, 2022 | 04:59 PM
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Originally Posted by 2ZORNOT2Z
If you go with ARH or Kooks the 2" will fit no problem. I tried Texas speed first and had nothing but problems getting them to fit. Switched to Kooks and no issues. Otherwise, what Internets_Ninja said...
Too tight of a fit with the TSP? I was also interested in the Stainless Works headers. I don’t have any experience but I’ve heard they’re very quality
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Old Apr 9, 2022 | 08:47 AM
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I only recommend ARH or Kooks headers after the experiences I have seen. You might be okay with a cheaper brand, but then you might also purchase yourself a large headache. ARH fit, finish, quality and customer service is the best in the business in my opinion.
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Old Apr 9, 2022 | 09:46 AM
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Kooks 2" fits great on mine. Might as well just spring for the 2" instead of having regrets later about it.
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Old Apr 9, 2022 | 10:42 AM
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INTERNETS NINJA have you worked with the cat delete only pipes? oem headers look like they flow decent at least for my goals (650-700 wheel) have been looking for the outfit that made the delete pipes but haven't found them yet
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Old Apr 9, 2022 | 07:39 PM
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Originally Posted by 9sec
INTERNETS NINJA have you worked with the cat delete only pipes? oem headers look like they flow decent at least for my goals (650-700 wheel) have been looking for the outfit that made the delete pipes but haven't found them yet

No I wouldn't consider cat delete pipes. They simply cannot match the power of long tube headers. I know there are dyno charts out there that make it look like they give you 90% of what long tubes get you, but that is a farce. I know some folks like them but I never saw the purpose of making the car louder and then leaving power on the table.

I don't know if you're going to find anyone that makes cat deletes anymore. The EPA has been going after everyone.
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Old Apr 10, 2022 | 12:26 AM
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I'm new to the C7Z platform but new to modded F.I. cars (last car was a twin turbo Viper). I'm guessing that, while catless downpipe might be close to peak HP of longtubes, they are no where close when it comes to HP and TQ across the entire band. This is where longtubes really shine.

For the OP, as Ninja said, get the 2 inch Kooks or ARH. You will thank yourself during the install and every time you step on the accelerator.
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Old Apr 11, 2022 | 12:35 AM
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Originally Posted by Internets_Ninja
No I wouldn't consider cat delete pipes. They simply cannot match the power of long tube headers. I know there are dyno charts out there that make it look like they give you 90% of what long tubes get you, but that is a farce. I know some folks like them but I never saw the purpose of making the car louder and then leaving power on the table.

I don't know if you're going to find anyone that makes cat deletes anymore. The EPA has been going after everyone.
What kind of power increase can I expect to get from Kooks 2” and off road pipe? 2017 Z06 that is stock otherwise. You probably don’t remember, but you helped me tune my 2014 Stingray a couple years back.
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Old Apr 11, 2022 | 09:24 AM
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Originally Posted by jaywoo
What kind of power increase can I expect to get from Kooks 2” and off road pipe? 2017 Z06 that is stock otherwise. You probably don’t remember, but you helped me tune my 2014 Stingray a couple years back.

I do remember a car where the owners name was Jay, or at least that's how I named the client folder on my laptop.

As for gains on with 2 inch headers, depending on the dyno and assuming you have the car tuned as well, anywhere from 30-50 rwhp peak. On a normal reading dyno it is usually in the 30-40 range. Generous dynos can show upwards of 50-60. Heart Breaker dyno's can show 20-25. The reality is Headers plus a tune definitely wake the car up enough to feel and you can see the difference at the track or when using the Draggy App with the GPS module.
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Old Apr 11, 2022 | 12:49 PM
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Originally Posted by Internets_Ninja
I do remember a car where the owners name was Jay, or at least that's how I named the client folder on my laptop.

As for gains on with 2 inch headers, depending on the dyno and assuming you have the car tuned as well, anywhere from 30-50 rwhp peak. On a normal reading dyno it is usually in the 30-40 range. Generous dynos can show upwards of 50-60. Heart Breaker dyno's can show 20-25. The reality is Headers plus a tune definitely wake the car up enough to feel and you can see the difference at the track or when using the Draggy App with the GPS module.
That was probably me yep. If you’re still doing that, I’ll need help with this one also. I sold the 2014 and bought the 2017 Z06.

I don’t want crazy horse power. Probably just 650 or so at the tires. Figured the long tubes was a good place to start.
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Old Apr 11, 2022 | 04:05 PM
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Originally Posted by jaywoo
That was probably me yep. If you’re still doing that, I’ll need help with this one also. I sold the 2014 and bought the 2017 Z06.

I don’t want crazy horse power. Probably just 650 or so at the tires. Figured the long tubes was a good place to start.
Sent you a PM
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Old Apr 11, 2022 | 05:15 PM
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Originally Posted by Internets_Ninja
No I wouldn't consider cat delete pipes. They simply cannot match the power of long tube headers. I know there are dyno charts out there that make it look like they give you 90% of what long tubes get you, but that is a farce. I know some folks like them but I never saw the purpose of making the car louder and then leaving power on the table.

I don't know if you're going to find anyone that makes cat deletes anymore. The EPA has been going after everyone.
Maybe I’m missing something, but im at 820’s on pump gas and 960’s on e85 with downpipes and x-pipe instead of headers…
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Old Apr 12, 2022 | 06:19 AM
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Originally Posted by Bexe
Maybe I’m missing something, but im at 820’s on pump gas and 960’s on e85 with downpipes and x-pipe instead of headers…
I never said you can't make power without headers. I said you can't match the power of headers with down pipes. Meaning mod for mod, the car with headers will make more power over downpipes 99.99999% of the time. You would pick up power if you added headers to your setup(assuming you aren't out of fuel). Not sure why you're offended by my statement but seems that you misunderstood my response to the OP's question.
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Old Apr 12, 2022 | 08:13 AM
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Originally Posted by Internets_Ninja
I never said you can't make power without headers. I said you can't match the power of headers with down pipes. Meaning mod for mod, the car with headers will make more power over downpipes 99.99999% of the time. You would pick up power if you added headers to your setup(assuming you aren't out of fuel). Not sure why you're offended by my statement but seems that you misunderstood my response to the OP's question.
not offended just don’t understand why you’re spreading misinformation. Headers may make more peak power, but total power under the curve I’ve not seen a graph with two similarly modified cars that the header car did anything to write home about. On a an NA car yes the scavenging matters with headers with the FI cars we have it’s not making the difference you think it is so long as you have the overall ability to move the volume of exhaust gases with little resistance. It’s why I suggest the downpipes as the stock manifolds are a well made design that flow well for an FI setup and the downpipes are well made and your not flushing an extra $1000 on parts not to mention the required labor that almost matches the extra cost of parts.
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Old Apr 12, 2022 | 02:55 PM
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Originally Posted by Bexe
not offended just don’t understand why you’re spreading misinformation. Headers may make more peak power, but total power under the curve I’ve not seen a graph with two similarly modified cars that the header car did anything to write home about. On a an NA car yes the scavenging matters with headers with the FI cars we have it’s not making the difference you think it is so long as you have the overall ability to move the volume of exhaust gases with little resistance. It’s why I suggest the downpipes as the stock manifolds are a well made design that flow well for an FI setup and the downpipes are well made and your not flushing an extra $1000 on parts not to mention the required labor that almost matches the extra cost of parts.
Let's just agree to disagree and move on.
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Old Aug 13, 2024 | 08:31 PM
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So on a stock 2019 C7 ZO6 car, can you still make power with ARH 2inch headers?
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Old Aug 14, 2024 | 11:27 AM
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I'm very happy with my Kooks headers. I've put them on a C6 GS and my 16 Z06. If I remember they were both 1 7/8ths. On my Z06 2"s would probably give a few more ponies, but not that much. I haven't been to a 1/4-mile track in some time, but it should run high 8's in the 1/4.


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