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Old 05-22-2022, 08:51 AM   #23703
Compelica
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How do you like the power difference compared to stock?

I tried a 2017 decatted header and ultimately swapped back to my gruppe-s after trying different header/catback setups.
I've not installed it yet - am still on a decatted 2013 header. But between that and a stock header with a tune is a very appreciable difference after 4K rev.

I'll have to retune for the 2017 headers to get the most out of it, but I would assume there would be a slight reduction at the low end due to the larger pipe diameters.
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Old 05-22-2022, 12:45 PM   #23704
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Decatted a 2017 header.

An observation - the honeycomb on the cat of a 2017 is approximately 5% heavier compared to a 2013 cat.
Im pretty sure decatting has been proven on this cars to cause a loss or minimal gain of HP due to the distortion of air created.
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Old 05-22-2022, 01:00 PM   #23705
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WHAT DID YOU DO TO YOUR FRS TODAY?

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Im pretty sure decatting has been proven on this cars to cause a loss or minimal gain of HP due to the distortion of air created.

Lol no. PM rice_classic. For SCCA T4 they have to run the stock manifold but are allowed to decat it. They are making numbers comparable to most headers on the market.

Edit: you also donít just punch the cat out. You cut that section out and replace it with a piece of tube. So what distortion?
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Old 05-22-2022, 01:48 PM   #23706
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Im pretty sure decatting has been proven on this cars to cause a loss or minimal gain of HP due to the distortion of air created.
It does make additional torque and power when paired with a tune.
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Old 05-22-2022, 02:12 PM   #23707
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Lol no. PM rice_classic. For SCCA T4 they have to run the stock manifold but are allowed to decat it. They are making numbers comparable to most headers on the market.

Edit: you also donít just punch the cat out. You cut that section out and replace it with a piece of tube. So what distortion?
Yes if you replace with pipe its fine, most just drill out the honeycomb leaving a chamber of distortion
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Old 05-22-2022, 02:23 PM   #23708
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Yes if you replace with pipe its fine, most just drill out the honeycomb leaving a chamber of distortion

Most? Iím all my years Iíve never seen or spoken to anyone who has drilled out a cat. Iíve heard of people knocking loose cores out with a pipe. But drilling, no. Iíd be far easier to cut it out. The disruption in flow and resonance would be minor, no worse then a UEL and people have hard ons for those.
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Old 05-22-2022, 02:38 PM   #23709
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Are the LEDs plug and play? I've been thinking about this too. So the Vlands only give you the boomerang and turn signals, no high beam/low beam bulbs?

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Switched the OEM Halogen bulbs with the Sylvania LEDs, both low and high beamsAttachment 211975

Only temporary as I wait for my Vland headlights to arrive!
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Old 05-22-2022, 07:58 PM   #23710
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Are the LEDs plug and play? I've been thinking about this too. So the Vlands only give you the boomerang and turn signals, no high beam/low beam bulbs?

Yes they are! You can get H11 bulbs from anywhere and theyíll fit the low beams. I forgot which bulbs are the high beams, but they are also plug and play. The Vlands donít give you bulbs, you have to order them! However, if you get the OLM headlights from FTSpeed (the ones on my car), they come with an HID projector, bulbs, and ballast, all with it for not too much more. Definitely the way to go in my opinion!
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Old 05-23-2022, 10:59 AM   #23711
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How do you like the power difference compared to stock?

I tried a 2017 decatted header and ultimately swapped back to my gruppe-s after trying different header/catback setups.
I forgot to ask. Would like to hear on why you preferred the Gruppe-S and the difference over the decatted header.
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Old 05-23-2022, 11:21 PM   #23712
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took a side profile shot of my ride, these cars are so beautiful Name:  IMG_0189.jpg
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Old 05-24-2022, 01:56 PM   #23713
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I forgot to ask. Would like to hear on why you preferred the Gruppe-S and the difference over the decatted header.
The powerband with the gruppe-s feels better to me.
Power from 3500-5500 felt smoother and stronger. I also like the sound of UEL with stock catback over stock setup.

Tuning with both headers was done by @tomm.brz

I went from gruppe-s to decatted back to gruppe-s. It was an experiment to see if a different header would make the greddy SP catback I purchased useable for my ears.
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Old 05-25-2022, 12:32 PM   #23714
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Originally Posted by RToyo86 View Post
The powerband with the gruppe-s feels better to me.
Power from 3500-5500 felt smoother and stronger. I also like the sound of UEL with stock catback over stock setup.

Tuning with both headers was done by @tomm.brz

I went from gruppe-s to decatted back to gruppe-s. It was an experiment to see if a different header would make the greddy SP catback I purchased useable for my ears.
Any dyno graphs with both headers?
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Old 05-25-2022, 12:41 PM   #23715
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Any dyno graphs with both headers?
The car was street tuned with data logs on the same stretch of road. I have tried using virtual dyno to get a rough idea. I did not do a baseline so numbers are not worth much. Used a different road when doing the OEM decat unfortunately, so virtual dyno would be even less accurate for any sort of valid comparison.

This was gruppe-s tune, early-mid revision vs final with stock front pipe.






Gruppe-s with decatted front pipe
https://datazap.me/u/mygotousername/...d?log=0&data=1

Decatted with OEM front pipe
https://datazap.me/u/mygotousername/...log=0&data=1-7

Last edited by RToyo86; 05-25-2022 at 10:04 PM.
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Old 05-26-2022, 06:28 AM   #23716
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