F.I. HFC resonated cat pipes
 

So has anyone tested this system out? Seems like the perfect solution to more power and less noise. Matched up to a good CBE, this would be awesome for us non-tracking/racing members....

any thoughts?

Fast Intentions

If you have no worries about emissions, sure. But the test pipes are only good for maybe 2-3 hp over HFCs...

We don't have emissions tests here.... and I think the HP would still be the same or close as the standard HFC would it not?

.... and why aren't you installing spacers right now? ;)

They are being delivered today, I'll get to it on Sunday probably.

I've installed a set of Fast Intentions, Stillen, and a set of Berks on my cars. My best advice is to pick the HFC with the manufacturer of the exhaust you pick. It always seems to fit better and without any problems. Not that cross selection won't fit, but there always seems to be small differences between the manufacturers that require some form of adjustments.

That being said, I will have a set of Berk 200 metallic with extra bungs for sale in April. Just for your info.

What are you switching to? And why??

Having said that, PM a price! I am also interested in your opinion of the F.I. CBE. I think 6MT mentioned you had that system on your Z.

these are cats and not test pipes. they should be fine for passing emissions.

Dont test pipes replace the cats? I would think of them more as resontaed HFCs. I think they are a good product for helping keep the sound down some and still get the gains. I wanted them but they were a little pricy for me but they look just as well made as their CBE.

test pipes are a pipe that deletes the cat in the care, releasing restrictive flow, test pipes are a lot louder and more raspy. HFC allow you to pass emissions, yet are also less restrictive then factory cats, yielding higher HP then factory, and a little louder sound. You are able to get resonated test pipes though, for those who don't want as raspy sound but are able to run test pipes.

They are resonated HFC, you are correct.

Hey tony I heard the TDX with HFC's and I totally want HFC's now. I did not know you guys made resonated HFC's though. What are the gains on them versus the regular HFC's? Give me a call, I'm very interested in these!

I wonder if you have any audio clips with them installed. Stock and CBE version exhaust too. :excited:

I like the idea of reduced obstruction/greater flow but with some noise reduction too. I would like to add these into a CBE exhaust but not at the expense of noise.

"Noise" is personally subjective. If the restriction (OEM catalytic converters) is removed lower frequency noise will be generated. The resonated sections help reduce noise in some of the frequency bands but lower frequency sound will still be heard.

I LOVE low frequency... hate rasp!

I just installed FI test pipes on my370 Vert,took it on a 3hr drive in SE Ohio back roads- WOW worth every dime! Quality and power Thanks Tony@ FI!

Anytime my friend. Now that we know the cat back will fit your vert, we will get you squared away this week...

Thanks, Tony

Wanted find out more about this item. I'm not looking so much for HP gains, just want to change the exhaust note to something more suitable for the Z. Deep tone and no rasp...hate that tin-can rasp sound.

Resonated HFCs are the best of both worlds. On the G37 side this is an extremely popular product because its proven over and over and over again to keep away any unwanted rasp/drone but still giving you the added power gains you are looking for. If you are ready to place an order, or have any other questions please give me a call here at the shop!

Thank you, Blake

So what is the difference in having only the resonated CBE, versus having the resonated HFC also?? Meaning besides the minimal HP increase how does it change the sound. I'm assuming to some degree louder.

The resonator in the Cat will perform just like the resonator in the X Pipe. It is designed to be a noise canceling device. It does not hinder performance at all due to it's straight through perforated core design.

Now the resonator in the cat is obviously not as effective as the resonator in the X Pipe. Reason being it is much shorter and the O.D. Overall Diameter is smaller as well.

Now having resonators in the Cats and CBE will smoothen and quiet your exhaust note down.

Thanks, Tony

Tony, can your resonated HFC be installed on a FI setup (supercharger) without issues? i.e. burning up the core?

Thanks

You should not have any issues running HFCs paired with a Supercharger.

I would not recommend it with a TT kit though.

Personally I am not a fan of running aftermarket cats in stock location when the car is Forced Inducted. I have seen customers go 50,000 miles and others have the cats blow out in the first dyno session. A big factor in preserving the life of the HFC internal is your tune. If your AFR is all out of whack than you can consider your cats done! Meaning too lean or too rich. Being too rich you will constantly saturate the cat core in unburnt fuel and it will accelerate the deterioration of the cat core. Too lean and you will just cook the cat core.

All of that being said, if the tune is optimal which it needs to be or obvious reasons than you should see some life out of the cats. The better the cat core, the better chance it has to withstand the repeated daily abuse.

If you have any questions at all feel free to ask.

Thank you, Tony