Need Help Buying the Right HFC
 

Hello Folks,

First time poster here so apologies if any of this sounds ignorant but I do need some insight. I've caught the mod bug, very badly in fact. I have a 2014 370z (base model) and I've been upgrading it for about a year now.

I have:

• Stillen cold air intakes gen 3
• armytrix cat back exhaust (I know it was pricey and I could have went with a cheaper option but I do enjoy the sound. Having said that, after some research I should have went with the AAM R-Line 3 True Dual Exhaust system)
• stillen headers
• z1 performance upper intake manifold mod

Now I need help choosing the right high flow cat. I wanted to go with stillen but unfortunately they discontinued making high flows and headers. I know I should have gotten my HFCs sooner but I didn't. I have searched the web profusely for them and although some sites have them on their online inventory, when I call they tell me that it is an error and that they are out of stock currently.

My next option is to either dish out more money on ebay for those same stillen HFCs or go with another brand that has great quality. Reading up a little bit on this and Berk HFCs come up.

Is this a good purchase for me? Is it ok to have so many mixed and matched parts in my build? Will there be any fitment issues between the stillen headers and the berk (or other) HFCs? (**Straight pipe or long tube headers are NOT an option for me**)

I have not had my car tuned or up on a dyno yet because I'm waiting on this last piece to do so. I'm anticipating something around 335 - 350 at the rear wheels after everything is installed and tuned.
I plan on getting new calipers and rotors as well as a new suspension later on this year. But for now I need some advice on where to go for my HFCs. Berk, AAM, Fast intentions etc....which brand will give me the best bang for my buck?

Any tips would be greatly appreciated!

Cheers

Fast Intentions HFC's are what you need. Your rear wheel HP are way to high. Expect around 315 to 320hp (maybe lower) at the wheels.

Ive seen alot of praises on berk and fast intentions hfc's. I plan on going with art pipes when I get my z. I had hfc on my 300zxtt years ago as well as on my sentra spec v and now i live in area with no emissions testing so I think im gonna go the test pipe route. Never had test pipes before.

When I was in the market for hfc's I read up on berk and some complained about it throwing a codes.

Go with fast intentions hfc's and you won't be disappointed. Sounds good, power gains and they never threw a code.

I have berks hfc on my z and they are great

FI HFC'S are on order and I'm super excited! Heard nothing but good things!

I bought Fast Intentions myself and got them in a few days ago. I stumbled across one instance where as set of FI RHFC's failed due to not being attached to a brace on the G37 forum. Any failures being reported here? You'd think, for the cost, they'd come with the proper tabs to attach to the stock brace.

As many of the options have been out for a while now, I'd love to hear more about long term durability.

Berk HFC have worked well for me, had them on for well over a year now and they did come with a brace tab, no issues other than the occasional SES light when I am driving long distances at a consistent speed, 50+ miles of highway.

I installed mine first when my stock CBE was on and they even gave a lot deeper sound, definitely no complaints and am happy with my purchase, fitment was spot on to stock and when I installed the FI exhaust they were sturdy and didnt look too bad for a year old Cat in the Chicago weather and even fit well onto the FI.

These have about 10k miles on them. Never gave me any issues.

Maybe it was indeed a fluke. I may look at installing some sort of bracing regardless. Just seems like they should come with a mounting bracket regardless.

Here's the failure, post #341.
My Mod + Dyno Log - Page 23 - MyG37

On the next page, a member named Rochester tabbed up a bracket for the FI RHFC's.

I also have Berks hfcs non resonated ones and they have been great no problems either or no check engine lights on. I had them installed for about a year now also.

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Folks thank you so much! I'm going to go with the Fast intentions HFCs!

Stillen headers and gen 3 cold air intake + z1 upper intake manifold mod + FI HFCs + Armytrix CBE! This setup is going to be LOOOOUD! I'll post a video as soon as I get it up on the dyno

Wait time for FI is a killer, but so worth it!

Wait is over, woohoot!!!

Hmm... I seriously think these FI cats might be on my "to do" list, probably sooner than later. Thinking about the non-resonated cats though. I mean, is there really that much difference between the resonated and non-resonated cats as far as sound goes?

I've heard there is a noticeable difference between the two. I just installed mine (resonated) on Monday. Paired up with a stock IPL (Nismo) exhaust, there's a slight increase in noise. It does make the exhaust sound better overall and there's a small amount of deep bass increase (borderline droning but not quite) for a few hundred rpm below 2K. Turns into a nice smooth burble above and a scream higher up in the rpm range. Too much rain to really test them out at the moment.

There's a big increase in vibration at idle. You can feel it through the seat, pedals, steering wheel, shifter. It's due to the lack of a bracket which I still contend should be addressed by FI for the cost. I'm going to go to the extra effort and cost to have some welded up and installed. Otherwise there's no support between the header to cylinder head bolts and the rear muffler section. That's a lot of pipe length without brackets.

I don't that either about omitting the mounting tabs, BUT... If the welds on the FI cats are good as well as thick metal used, it should hold up pretty well without failing. The exhaust isn't all that heavy and is still supported in the middle and rear of the car.

For some reason on the G37 IPL, it isn't supported in the middle. Also, I've seen at least one set that's failed, at the weld, most likely due to no support.

You're not kidding....I get them 4 - 6 weeks from now :icon14:

I've had the Berk HFC and CBE for over three years with never getting any warning lights on. The fit was spot-on and the sound with the CBE is amazing. There is the occasional "hiss", but it makes the Z sound exotic...

Wooo hoo!!! Just got the Fast Intentions HFCs today!

Man that was a LOOOOOONG Wait!

https://s10.postimg.org/6gptisx2x/IMG_3277.jpg

Installing tomorrow, Z1 plenum, Fast intentions HFCs and Stillen headers! (so far I have stillen cold airs and armytrix catback exhaust)

Will get it tuned via ecuteck using e85 fuel! I will post my Dynosheet and let you know how much I've gained.


CHEERS!!!!!

Yay!!!

I have been running 40% ethanol by mixing 1.3 gallons of 93E10 for each gallon of E85. My Z has an Ecutek 93 octane tune for a stock 370Z. The part throttle fuel trims adjust to the ethanol percentage nicely. The wide open throttle A/F leans out from 12.0 to 12.5. The gain in the car's performance is addicting.

Everything is installed and ready for a tune, but if I'm honest I don't like how my car sounds anymore. I preferred the armytrix exhaust note with the stock cats. Not sure if it's the new headers or the fast intentions high flow cats or a combination of both that have drastically changed the note of my car. I was expecting the mods to enrich the sound not completely change it. I guess that's what I get for my ignorance but luckily my exhaust system is valvetronic so I can choke the sound if I want to.

Performance wise, love it. I'm sure I'll love it more when the tune is in place


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Yep, it's been about a week with the new mods and I'm still not enjoying the new exhaust note. It's too abrasive and not as unique as it used to be.

I'm going to sell these fast intentions HFCs and go with a pair equipped with resonators.

If anyone is interested in buying some fast intentions High flow cats DM me.

They only have 70 miles on them and you won't have to wait 6 weeks to get a pair from Fast intentions ;)


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Need Help Buying the Right HFC
 

https://s27.postimg.org/qd74bo537/tune.png



On pump gas too not e85 yet.

How about that? :tiphat: