Nameless Performance Equal Length Stepped Header

[NoHaveMSG]

Yup. Catted and resonated front pipe, stock midpipe, ultra quiet track pipe. It's really not even that loud.

[weederr33]

Originally Posted by Ultramaroon

I think it was HKS that first offered a catted front pipe with a bung and extension for relocating the secondary o2 sensor. Now I can only find this.


https://www.ftspeed.com/part/s6z12e3...pipe-2013-ft86

Yep, they still do. I actually went the full length to acquire that front pipe a few years ago. It comes with their catless header and a catted and muffled front pipe that has an O2 sensor extension and tap. Absolutely not worth the money if you're anything less than a parts snob like myself.

https://www.hks-power.co.jp/en/produ...haust/db/15165

[Ultramaroon]

Originally Posted by weederr33

Yep, they still do. I actually went the full length to acquire that front pipe a few years ago. It comes with their catless header and a catted and muffled front pipe that has an O2 sensor extension and tap. Absolutely not worth the money if you're anything less than a parts snob like myself.

https://www.hks-power.co.jp/en/produ...haust/db/15165

I'd say if it legitimately doesn't throw a p0420, then it would be worth the peace of mind to know that I'm not being a complete NOx-rolling asshole. Maybe not as good as full stock, but still above the alarm threshold, FWIW. That's the only way I would do an aftermarket header.

[Scargod]

Originally Posted by sato

Any additional benefits of the 321 alloy other than better oxidation and corrosion resistance? Does it retain heat better, less expansion or something?

Yes. Besides the corrosion resistance and resistance to high temps, parts can be made thinner and thus lighter. I made a twin scroll up pipe for my 470 HP STI out of .031" 321. It has been perfect for years of track days.
It must be welded properly with back-purging. Takes a decent TIG welder to work with it.