What is the difference between HFC and test pipe?

Rhett · 07-04-2010, 01:05 AM

Hi, Guys!

I think that this is a silly question, but I really don't know the difference between HFC and test pipe. I just know that HFC is more expensive than test pipe.

Also, will you recommend the HFCs and test pipes.

Thanks!

Rhet in Seattle

XwChriswX · 07-04-2010, 01:23 AM

Hey Rhett,

HFC or (High Flowing Catalytic-Converter) is basically the same device that's already built into your cars exhaust system that converts the exhaust gasses.

An HFC is just a smaller cell of them that flows free-er letting you regain some performance lost. It still suffices as a cat for those states that require them and do emissions testing...

A Test Pipe or Resonated Test Pipe has NO cat of any sort in it. Resonated ones carry a resonator, but just to drown sound and rasp, not any sort of chemical conversion. So what comes out of your engine, comes out of your exhaust. (Gas wise)

HFC's will give you better numbers than Stock cats, and (Resonated) Test Pipes will give you better numbers than HFC's due to the freedom of gasses to flow.

Hopefully this broke it down for you enough to make a decision based on your particular situation. If you already knew most of that, I was not trying to make it sound as if you were not knowledgeable, just pointing out all the details.

Chris in Avondale

Trips · 07-04-2010, 01:45 AM

Thank You Chris, for an exellent reply. a rep for your help.

XwChriswX · 07-04-2010, 02:11 AM

Quote:

Originally Posted by Triple's

Thank You Chris, for an exellent reply. a rep for your help.

The whole time I was writing it I was thinking...

"What would Trip say?"

Trips · 07-04-2010, 02:13 AM

Quote:

Originally Posted by XwChriswX

The whole time I was writing it I was thinking...

"What would Trip say?"

Then you added waaay to much info, but thank you.

XwChriswX · 07-04-2010, 02:35 AM

Quote:

Originally Posted by Triple's

Then you added waaay to much info, but thank you.

So I like to be thorough... whats so wrong with that?

AK370Z · 07-04-2010, 03:01 AM

Thanks for the explanation (helping out another member). +1 rep

Rhett · 07-04-2010, 03:07 AM

Quote:

Originally Posted by XwChriswX

Hey Rhett,

HFC or (High Flowing Catalytic-Converter) is basically the same device that's already built into your cars exhaust system that converts the exhaust gasses.

An HFC is just a smaller cell of them that flows free-er letting you regain some performance lost. It still suffices as a cat for those states that require them and do emissions testing...

A Test Pipe or Resonated Test Pipe has NO cat of any sort in it. Resonated ones carry a resonator, but just to drown sound and rasp, not any sort of chemical conversion. So what comes out of your engine, comes out of your exhaust. (Gas wise)

HFC's will give you better numbers than Stock cats, and (Resonated) Test Pipes will give you better numbers than HFC's due to the freedom of gasses to flow.

Hopefully this broke it down for you enough to make a decision based on your particular situation. If you already knew most of that, I was not trying to make it sound as if you were not knowledgeable, just pointing out all the details.

Chris in Avondale

Thanks a million, Chris!! You are a great man!

XwChriswX · 07-04-2010, 03:31 AM

Quote:

Originally Posted by Rhett

Thanks a million, Chris!! You are a great man!

Finally!!! Someone speaks the truth everyone else knew but just didn't want to say out loud!

Trips · 07-04-2010, 03:34 AM

Ok!! pickup your panties and Leave Now!!!

XwChriswX · 07-04-2010, 03:40 AM

Quote:

Originally Posted by Triple's

Ok!! pickup your panties and Leave Now!!!

Justin1686 · 07-04-2010, 09:19 AM

great exp. +1

Westwood · 07-04-2010, 09:31 AM

Quote:

Originally Posted by XwChriswX

Hey Rhett,

HFC or (High Flowing Catalytic-Converter) is basically the same device that's already built into your cars exhaust system that converts the exhaust gasses.

An HFC is just a smaller cell of them that flows free-er letting you regain some performance lost. It still suffices as a cat for those states that require them and do emissions testing...

A Test Pipe or Resonated Test Pipe has NO cat of any sort in it. Resonated ones carry a resonator, but just to drown sound and rasp, not any sort of chemical conversion. So what comes out of your engine, comes out of your exhaust. (Gas wise)

HFC's will give you better numbers than Stock cats, and (Resonated) Test Pipes will give you better numbers than HFC's due to the freedom of gasses to flow.

Hopefully this broke it down for you enough to make a decision based on your particular situation. If you already knew most of that, I was not trying to make it sound as if you were not knowledgeable, just pointing out all the details.

Chris in Avondale

good info! i was wondering about the gains between the hfc's and test pipes

OhYeah · 07-04-2010, 09:57 AM

THx for info
I was wry the same thing... what about the sound???

m4a1mustang · 07-04-2010, 10:03 AM

Quote:

Originally Posted by OhYeah

THx for info
I was wry the same thing... what about the sound???

Test pipes are going to be louder than HFCs. They will also be a good bit more raspy, and the well documented deceleration hiss will be more pronounced with test pipes.

07-04-2010, 01:05 AM	#1 (permalink)
Rhett Base Member Join Date: Apr 2010 Location: Seattle, WA Posts: 51 Drives: 09 370z Touring SP M Rep Power: 15	What is the difference between HFC and test pipe? Hi, Guys! I think that this is a silly question, but I really don't know the difference between HFC and test pipe. I just know that HFC is more expensive than test pipe. Also, will you recommend the HFCs and test pipes. Thanks! Rhet in Seattle

07-04-2010, 01:23 AM	#2 (permalink)
XwChriswX WFLYIDNNE Join Date: Jul 2009 Location: In The Fastlane Posts: 50,648 Drives: 02 GDB WRX Rep Power: 452	Hey Rhett, HFC or (High Flowing Catalytic-Converter) is basically the same device that's already built into your cars exhaust system that converts the exhaust gasses. An HFC is just a smaller cell of them that flows free-er letting you regain some performance lost. It still suffices as a cat for those states that require them and do emissions testing... A Test Pipe or Resonated Test Pipe has NO cat of any sort in it. Resonated ones carry a resonator, but just to drown sound and rasp, not any sort of chemical conversion. So what comes out of your engine, comes out of your exhaust. (Gas wise) HFC's will give you better numbers than Stock cats, and (Resonated) Test Pipes will give you better numbers than HFC's due to the freedom of gasses to flow. Hopefully this broke it down for you enough to make a decision based on your particular situation. If you already knew most of that, I was not trying to make it sound as if you were not knowledgeable, just pointing out all the details. Chris in Avondale __________________ Bonnie - Stage 2, Audio build coming this fall! R.I.P. Abby 3/29/10 - 3/30/14

07-04-2010, 01:45 AM	#3 (permalink)
Trips Administrator Join Date: May 2009 Location: Disneyland, Ca Posts: 8,730 Drives: 🔰 Rep Power: 10	Thank You Chris, for an exellent reply. a rep for your help. __________________

07-04-2010, 03:01 AM	#7 (permalink)
AK370Z Administrator Join Date: Sep 2008 Location: NJ Posts: 9,930 Drives: 09 370Z MB Sports M6 Rep Power: 10	Thanks for the explanation (helping out another member). +1 rep __________________ The370Z Signature Pictures ll Want to rock our forum decals on your car? Then click here! ll How to Embed YouTube Videos In a Post STOP! (Hammertime) ll Become a Premium Member Click HERE ll F.A.Q. Are You a Nissan Dealer? Click Here to Become A "Supporting Dealer" and Start Listing Your 370Zs In Our Inventory Section My Monterey Blue Z ll My Exhaust --> My Intake --> G3 Nissan's Official Response Regarding Oil Temp Issue: CLICK HERE Need a Set of Cheap Winter wheels /Tires? Then Visit The Banner Link Below and Place Your Order. You'll Help Keep The370Z Alive.

07-04-2010, 03:34 AM	#10 (permalink)
Trips Administrator Join Date: May 2009 Location: Disneyland, Ca Posts: 8,730 Drives: 🔰 Rep Power: 10	Ok!! pickup your panties and Leave Now!!! __________________

07-04-2010, 09:19 AM	#12 (permalink)
Justin1686 Track Member Join Date: Apr 2009 Location: Nassau, NY Age: 38 Posts: 689 Drives: 09 370 PG AT Rep Power: 17	great exp. +1 __________________ 2009 Touring & Sport Package \|\| Platinum Graphite \|\| 40% 3M Tint \|\| Xpel Clear Bra \|\| Berk CBE \|\| Berk HFC \|\| Stillen Sway Bar \|\| H&R Spacers \|\| Swift Springs \|\| SPC Rear Camber Kit \|\| Thanks to Savage Autosports, VTR, PM, and R.A.D.

07-04-2010, 09:57 AM	#14 (permalink)
OhYeah Base Member Join Date: Jan 2010 Location: Thailand Posts: 79 Drives: 370z 40th Rep Power: 15	THx for info I was wry the same thing... what about the sound???

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