Please contact our email address so we can get this resolved. I checked our inbox and don't see anything concerning this issue. We're still manning emails while we're in CT for Wicked Big Meet.

If the dealer told you that the cat is bad or needs to be replaced based on the code, I would not rely on what the dealer tells me. P0420 could happen for many different reasons.
Have you checked for any exhaust leak near o2 sensors? Is there any other exhaust mods??

Can @FT-86 SpeedFactory please clarify this please?? :)

This is what we have on the site for the header product description.

"No CEL, as well, for those who wish to not stare at a light on the dash when using the header alone. If you have other mods, you will want to utilize a tuning solution as you have dramatically changed air volume with intake or cat back exhausts."

He has an aftermarket intake that is most likely causing the CEL to come on combined with our header.

@FT-86 SpeedFactory

I was asking about below NOT about the CEL.

It isnt... At first it was written it was highflow, then they changed it... One of the reasons i got rid of the cat... I was dissapointed when this info surfaced, but i had already recieved mine

Why the fuck would you go to the dealer with aftermarket headers? Of course the code will obviously be exhaust related

Sent from my A0001 using Tapatalk

Why not??? .
It's no different then any other aftermarket part. You must have the fancier CEL indicator that displays the code on the dash.
I'm not going to get in a pissing match over this. I was just relating on experience I had.

My SRT-4 does this :)

But in all seriousness, why didn't you just go to autozone or something and get the code read for free?

Because when modifying a car regardless of cat don't you know the codes that will usually come up after said mod? Also autozone and parts store do it for free or you could invest in a $5 elm 327 obd2 bluetooth dongle and do it yourself with a smartphone.......

Sent from my A0001 using Tapatalk

I got this response from FT-86 and my only suggestion was that they move the note to the top of the description and not have it buried in the middle.
I should have read the "fine print":bonk:
Like I said before this isn't worth getting into a pissing match over.
I haven't been to the forum in quite awhile and now remember why.
Caveat Emptor!

They seem pretty intent on not answering this.... I've seen multiple people ask this question with no response that I've seen from @FT-86 SpeedFactory

To resolve the issue could you just get one of those 02 sensor spacer thingys?

There's an awesome and powerful great trick called "getting a tune"

That blog post is wicked old and was made before we really finalized the product.

Because we have answered it before in this thread and others.

The header comes with a normal cat rated for 5 liters of air flow and is 49 state legal. This car does not produce even close to 5L of airflow so it is more than ample.

Again, which we have said a few hundred times now it feels like. The ft86 owners a while back wanted a header that on a stock car removed the torque dip, and provided no CEL. This header does just that and we tested for 5000 miles in three separate cars, in 3 different climates before releasing.

If you make another modification, like intake or something else exhaust wise, you are changing the formula for this header and you could then get a CEL. A tune is always highly recommended but for the guys who enjoy their car the way it is, and want to get rid of the torque dip that is exactly what this header is for.

We stand behind our product and to date, there has been two cat actual cat failures. Both of those we replaced under our warranty.

That very true and there's this awesome and powerful thing call a "budget".

Well then you're not budgeting your time or money correctly if you don't see a foreseeable common issue.....
Also its not proper to not have a tune with a "serious" mod like this, you won't get the proper gains and the car will just be plain inefficient

Save a bit longer and then do it all at once.

Been slacking on making a video but here's a few pulls with my set up.

FT86SpeedFactory Catted UEL Header
Stock Over Pipe
Motiv Catted Front Pipe
Greddy Supreme Sp Cat-Back

[ame="https://www.youtube.com/watch?v=76vPClIAky0"]Greddy Supreme Sp Cat-Back Exhaust for FRS/BRZ - YouTube[/ame]

You are forgetting, some of us live in states where you will not pass inspection with most any CEL being thrown. Suppressing the CEL makes the ECU show a forced readiness situation and it wont pass. Throwing the guy inspecting your car a 50 doesn't work either because the computer they use to check your ECU is owned by the state. It sucks. If anyone knows a way around it that doesn't involve swapping parts back and forth, I would love to hear it. THAT is the market for these headers... why would you get a catted header otherwise?

I got my catted header and headerback to kill the torque dip (which it does quite well) and replace the uninspiring noises made by the stock car, while not needing a tune whatsoever. I never expected big gains, but the low and midrange gains were noticeable, more so than I thought they would at least. Truth is, even with a tune the gains you will see won't really be worth the money unless you can run E85, which I can't get near me.

I'm guessing you don't know much about the car, because a tune is a surefire way to pass emissions as long as a sniffer is not involved, the tune is for getting rid of the risk of a CEL.....sarcasm...

Just chiming in. I have been running a TRD intake & catback, FT86SF UEL Catted Header and OFT Stage 1 UEL tune for nearly 14,000 miles. From time to time I would get a P0420 reading and I brought the car into the install shop for a quick safety check. No issue was found. After said point, I simply cleared the code manually each time it popped up.

Lately, I have been getting the CEL P0420 on an almost weekly basis. Out of sheer annoyance I am planning to use ROMRaider to flip that switch off, however I worry that I could miss an actual problem should the cat fail, a sensor go bad, etc. What would you recommend? This is my first "tuner car"...

Just do it. You'll be able to smell/feel a difference if the cat were to actually fail (worst case, the exhaust would be "clogged", hurting performance)

Thanks for the vote of confidence. When you say smell, it should be an exhaust smell, appearance or feel and not gasoline? For some reason I have been smelling gas some morning when I start the car, wrote it off as closed quarters (driveway between two adjacent houses).

I was smelling a bit more of a "gassy" smell as well after I swapped out the factory cats (still have 2 cats: the FT86SF header and a Berk front pipe), which I presume is normal.

The P0420 code was coming on way too frequently for me (all I had was OFT, exhaust and intake hose), and I hated having to deal with the mushy pedal each time I cleared the code, so I finally went into RomRaider and disabled it... haven't slept better since.

Disabling the P0420 cel code does not disable either of the 02 sensors. All it disables is the triggering of the P0420 cel code. The ecu does some weird calculation based on readings from both 02 sensors to determine cat efficiency if it get results outside "normal" it sets the p0420 code.
The front sensor is used for afr by ecu, rear 02 for cat efficiency, cruise fueling

you will still trigger other codes if 02 sensors fail or fueling falls outside predetermined limits

I was under the impression that disabling the CEL would cause the ECU to not run its readiness checks. You would fail the inspection due to that even though you are not throwing a CEL. Tuning them out doesn't turn them off it just tells them to shut up. That was the case for my previous car at least, but I was running megasquirt in parallel, so its a bit different.

If you can tune out CELs with OFT on these cars and not hinder the ECU readiness checks, i'm going to be thrilled.

Are you still running the header without a tune? I would like to know if you've seen a CEL yet.

thanks!

Been running the header-back for about 2 months now with no CEL and no tune. That's about 4-5k miles with how much I drive (mostly highway). Its the full daily rage package on FT86SF's website. My intake is stock though and I suspect most of the people getting the intermittent highway CEL's with this header are running full aftermarket intakes.

Might want to stay with the stock intake or just run a drop in filter if you are worried about a CEL. Trying to decide if I want to test my luck with the Grimmspeed intake, which supposedly doesn't require a tune, but the more mods you have the higher the chances of a CEL.

Hey guys, just installed it and thought I should share the video we made this week-end. I didn't launch WOT because I wanted to see how it sounded like driving normally.

FT86 UEL catted header + Lachute Performance catback
https://www.facebook.com/715671437/v...8/?pnref=story

You're just lucky, I had the cel with the stock intake.

Getting ready for Ultimate Track Car challenge at VIR later this week!

We have these in stock at the moment too! :D

From all the videos I've seen, I haven't heard all that much rumble from this header. Maybe a little, but it's almost like an EL to me. Of course, videos don't really do justice. So how is the rumble?

The rumble is at its best when WOT between 2000 and 3000 (for me) particularly in 2nd, 3rd and 4th gear, but you kind of lose it in 5th and 6th (in the driver's seat, not from another car's perspective... if you ask someone to drive next to your car in 6th on the highway, it's definitely noticable)

CEL disapeared as fast as it showed up for me, within 24 hours it was gone. I have a an aftermarket catback and K&N Drop-In air filter. It's UEL is 6 inches difference, not the most UEL there is, but I like it.

Mine is plenty rumbley when I am cruising around. It does smooth out a bit in the higher rpms but I actually like that.

Same as above for me best rumble party is under 4k revs

This is the answer I got from the OFT guys.


"The P0420 is turned off when you run our stage2 map and no CEL will be present.

We are disabling the O2 monitor.

If you "catted" header is emissions friendly then you can simply run a stock tune when you need to pass your state emissions test. "



I assume if they disable the O2 monitor you will not pass inspection as the monitor will not be in a "ready" state.


I have a "hypothetical" acquaintance who shall remain nameless :).
He/she runs a catless header with an OFT stage 2 tune and supposedly gets the car passed emissions.
I will be seeing said "imaginary person" in a few weeks and pry out the secret from him/her :paddle:


:cheers:

I just passed a few weeks ago running the Stage 2 UEL tune. Didn't do anything special. Although my mechanic did have some trouble getting the machine to read my car the first few attempts... :iono:

Just curious, does NY require all monitors to be in a ready state? In NH, if any monitor shows "incomplete" (not ready) you will fail emissions. When you reset the code all the affected monitors go to their incomplete state until the required drive cycle requirements are met. Once met the monitors are ready and you carefully drive your car to the nearest inspection site and cross your fingers :sigh:.
I'll being talking to my "imaginary" friend to see what they do to get through inspection. Hopefully I'm wrong and the easy fix is to go with OFT. I'll post back later with what I find.
:cheers: