High-Flow Cats Discussion - HFC

Jerggy13

I have AAM HFCs enroute. Will be installed on our 2010 7AT w/ our pre-existing OEM Nismo takeoff catback.

Looking for increased performance and volume.

__________________
Changes come. Keep your dignity. Take the high road.
Take it like a man. Momma Sed Like the rain. Like a kidney stone.
Its just a broken heart, son. This pain will pass away.

10gSmith25

people do these mods for two main reasons IMO

sounds good

fun to do

nobody thinks there car is going to make a large jump in performance by bolting a particular pipe on

H2O_Doc

I beg to differ:

jcosta79

Hold my beer...

__________________
2012 PW NISMO #0559 - GT Spec Brace Kit - Swift Springs - ARK TP & Invidia CBE K&N Intake - UpRev Tune - 15mm Z1 Spacers & Studs - StopTech Slotted Rotors & SS Lines - ZSpeed CMAK with Stage 2 Clutch and Lightweight Flywheel

10gSmith25

i think in this case, that qualifies as a tank instead of a pipe

vindeezel

Did your AAM HFC ever throw a CEL?

dhoogerhyde

I'm running AAM HFCs and catback exhaust. Ran with no CEL for about 8 months and then came on. AAM didn't have an explanation. Installed standoffs on the O2 sensors on the cats, reset the CEL and running fine ever since.

H2O_Doc

I put on my Z1 HFCs ($375 ish shipped). More power, no CEL.

Meulen

I have HFC's and a cat back. That along with a Stillen Gen III air intake and my car came alive. It sounds good and runs better. Very noticeably faster. It wasn't that much more in the grand total of the exhaust so I just did it. I do have the SES light on right now though. Waiting a while for break-in so the computer re-learns the O2 readings and I'll have it cleared.

__________________
Follow my build thread here: Meulens Build Journal

Jordo!

If you can get away with it/live with it, TP's are one of the BEST bang for the buck mods, A set off ebay will do the job (you will need one or two sets of defoulers -- ideally at a 90* angle -- for secondary O2's or a tune)

I recommend resonated ones as the unresonated ones will be extremely raspy.

Whether N/A or FI, they will net gains.

Now if you can't get away with it for various reasons, go with (resonated) HFC's.

If you have the $$$, N/A or S/C, LTH would be my recommendation for maximum gains, although if you need a cat in there, you'll have to get creative.

I would look into defoulers or a tune... if the secondary O2's are the cause, that SES is related to the degree of delay between primary and secondary voltage readings, interpreted as due to the presence or absence of a functioning cat. When the voltage readings are too close together in time, that implies failed or missing cat and eventually trips the SES. The defoulers are intended to slow down exhaust gas from reaching the 2ndary O2 too quickly.

__________________
Enjoy it. Destroy it.

nycz370z

My Berks HFC was installed on Friday and all I have to say is that this is the best bang for your buck. However I do have an issue with my check engine light coming on the following day but my mechanic did warn me in advance. If your looking for performance and don't want to break the bank, go for the berks hfc because it makes a big difference in performance and sound once you get past 4k rpm.

Anyone have any advice on the check engine light?

vindeezel

Did you ever figure out your CEL issue? I have a 2011 Nismo that I plan on getting AAM HFC.

H2O_Doc

I know the SES light is difficult to predict, but I got the Z1 HFCs and have had zero issues. Good customer service as well.