Help: Headers vs High flow cats for 2018

[Flyhalf]

The only annoying issue I find with headers is the difference in cat location from stock. In many cases especially while tuned, you will not ready your O2 sensors because of this with long tube headers. If you can still use the stock tune, they will still ready. I believe it's the tune more than anything but they'll argue with you forever that "they are turned on".

I would probably do headers again though on a 2018+ because you don't need to change the intake manifold. You can still swap back to a stock tune if you need to for inspection. Would also go catless if running E85 too or have intentions of doing a supercharger later.

Thanks
I run e85 and no supercharger ever.

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[Brian@BMVK]

Outside of the fact that you probably won't pass sound with high-flows or free-flowing headers and the ATAK catback, there's only about a 5-10 max whp penalty going with high flow cats. Catted headers worth about 25 whp on the 2018+.

 

[Nuked]

Headers will net gains across the rpm range, especially in the midrange area. Is it worth the $, well that is up to you to decide.

 

[Flyhalf]

A cat delete would net you close to the same HP. If I was guessing, I would say cat deletes might gain 7 hp and full header might gain you 12 total.

Gettting the heat out the back instead ofunder the car could also help with cooling.

I like the idea to keep my OEM system stock without any cut.

 

[Flyhalf]

Outside of the fact that you probably won't pass sound with high-flows or free-flowing headers and the ATAK catback, there's only about a 5-10 max whp penalty going with high flow cats. Catted headers worth about 25 whp on the 2018+.

I was thinking a resonator or a new catback like the S TYPE.

So keep the atak for daytona and s type after?
Or just go with hugh flow cats and keep atak 3. Especially if the differences btw headers catted and not is minimal

 

[Flyhalf]

All great inputs guys. Please let's keep comment!

 

[Nuked]

I am confused by what exactly your after? From what I gather, emissions are not applicable to you as it is track only and volume/sound is not applicable to Daytona.

With that said I would get catless longtubes and just run dumps off of them at Daytona. The weight savings alone will net you a couple MPH. Then when not at Daytona run your existing catback and get a Magnaflow Tru-X resonator installed.

 

[Brian@BMVK]

I was thinking a resonator or a new catback like the S TYPE.

So keep the atak for daytona and s type after?
Or just go with hugh flow cats and keep atak 3. Especially if the differences btw headers catted and not is minimal

Add the Borla 60661 resonator and you'll be all set.

 

[GregO]

I don't drive the car on the street and this is for Daytona

My 2018 is track only.
Anyone has some data between HEADERS vs Highflow cats?

I assumed you were looking to use high flow cats on the track due to a sanctioned ruling.

 

[Flyhalf]

Add the Borla 60661 resonator and you'll be all set.

Apperently Not a plug and play. So i would need to cut my borla..

 

[TnWHTMARE]

Never heard of 10 hp gain on a cat back exhaust with a nearly stock car. Maybe I've missed that.

 

[K4fxd]

Headers will help, area under the curve, but I suspect you already know this.,

Any cork in the exhaust hurts power, high flow or not, they kill velocity.

 

[Flyhalf]

Never heard of 10 hp gain on a cat back exhaust with a nearly stock car. Maybe I've missed that.

Yep i tested. On dyno. Same result that Billy Johnson had in his test. 3" pipes are the key i think.

 

[Brian@BMVK]

Apperently Not a plug and play. So i would need to cut my borla..

Not true. Fits all the 3" Borla catbacks (which they all are for 2018+) directly in place of the X pipe.

 

[Flyhalf]

Not true. Fits all the 3" Borla catbacks (which they all are for 2018+) directly in place of the X pipe.

I called Borla and they told me this. Well great to know!

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