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Old 06-28-2013, 03:55 PM   #18
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I have Doug Thorley tri-ys 1 7/8" and they rub the steering shaft on hard turns. I love their sound too much to go with another set...but if your headers have a similar sound and great numbers for the L99, I might switch them out!
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Old 06-28-2013, 06:16 PM   #19
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Seeing stock next to these are like
No kidding. You think they might flow a little better?

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Old 06-28-2013, 06:23 PM   #20
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These headers not only have great ground clearance...they were also designed around the new electronic steering system which has a different knuckle....this means zero clearance issues across the board for everyone! The HP numbers have been great too
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No kidding. You think they might flow a little better?
Then where are the graphs???
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Old 06-28-2013, 06:56 PM   #21
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So will these bolt up to the stock cats?... I'm getting close to pulling the trigger on a set of SOLO hi-flow cats (which fit the stock manifold) + full catback with j-pipes and plan on doing headers next. I'd hate to spend the money and find out I'm gonna have to turn around and replace the cats again in a year.
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Old 06-28-2013, 07:03 PM   #22
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So will these bolt up to the stock cats?... I'm getting close to pulling the trigger on a set of SOLO hi-flow cats (which fit the stock manifold) + full catback with j-pipes and plan on doing headers next. I'd hate to spend the money and find out I'm gonna have to turn around and replace the cats again in a year.
No, these come with HF cats. So forget the solos.


Sent from my 2SS/RS
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Old 06-28-2013, 08:55 PM   #23
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So will these bolt up to the stock cats?... I'm getting close to pulling the trigger on a set of SOLO hi-flow cats (which fit the stock manifold) + full catback with j-pipes and plan on doing headers next. I'd hate to spend the money and find out I'm gonna have to turn around and replace the cats again in a year.
You can not use stock cats with long tube headers. You will also not be able to turn around and use the Solos with long tubes later. It is a totally different set up. Hold out on the cats and get them with your headers.
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Old 06-28-2013, 09:16 PM   #24
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You can not use stock cats with long tube headers. You will also not be able to turn around and use the Solos with long tubes later. It is a totally different set up. Hold out on the cats and get them with your headers.
Exactly! I had Solos with my shorties and had to sell them when I went LT's. I just bought the cats that go with the LT's and it bolted right up to my catback!
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Old 08-12-2013, 07:44 PM   #25
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Another view of the Tri-Ys;

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Old 08-13-2013, 06:25 AM   #26
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Another view of the Tri-Ys;

Great photo. People don't usually think to get one from the backside.
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Old 08-13-2013, 02:53 PM   #27
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the exhaust on my car has a 2 1/2 inch connection to a 3 inch x pipe do i need a new x pipe with these as well I bought the Flow Master AMT CAT back system
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Old 08-13-2013, 06:23 PM   #28
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the exhaust on my car has a 2 1/2 inch connection to a 3 inch x pipe do i need a new x pipe with these as well I bought the Flow Master AMT CAT back system
No, it will bolt up to your cat back.
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Old 08-15-2013, 03:59 PM   #29
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Just received/installed mine yesterday from apex. (Thanks again apex)

Fitment was great and easier install then my shorties and hi flow mid pipes.

Will be posting up a video of the pfadt headers and no mufflers.

Thanks pfadt for the great product!



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Old 08-21-2013, 11:05 AM   #30
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Just received/installed mine yesterday from apex. (Thanks again apex)

Fitment was great and easier install then my shorties and hi flow mid pipes.

Will be posting up a video of the pfadt headers and no mufflers.

Thanks pfadt for the great product!




Thanks for your order and for sharing the photos.

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Old 08-23-2013, 11:56 PM   #31
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That looks like its touching the second coil from left?! Man, I would wrap those headers, those clearances would make me nervous.
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Old 08-24-2013, 02:42 AM   #32
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What's the power difference? I still havent read anything to so me why these are better than the others.
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Old 08-24-2013, 03:07 AM   #33
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What's the power difference? I still havent read anything to so me why these are better than the others.
Just the way they are made, and NO they are not better than the rest.
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Old 09-03-2013, 08:12 PM   #34
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What's the power difference? I still havent read anything to so me why these are better than the others.
Give this a quick look. There is some information specific to the Tri-Y design in there.

Choosing The Right Long Tube Headers

So far the real world peak gains have been about in line with what you would expect from any of the premium brand headers but often with slightly stronger mid range gains. They are not some kind of new magical header but they are a very good new top tier header option for Camaro owners. Especially ZL1 owners since you do not have to cutting the belly pan.
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