What is the difference between HFC and test pipe?

Justin1686 · 07-04-2010, 09:19 AM

great exp. +1

OhYeah · 07-04-2010, 11:17 AM

why, muffler is not at the center of the car?? Is it Error during installation or production??
YouTube - Fast Intentions Exhaust w/ 12" Resonators - 370Z

m4a1mustang · 07-04-2010, 11:25 AM

That's just the angle of that video. FI uses two angled cannisters, not one single center mounted muffler.

efuseakay · 07-04-2010, 09:18 PM

I have ERZ HFCs on my G37 sedan. Love them. They were raspy with the stock exhaust, but once I installed my Fast Intentions system, the rasp totally disappeared.

There really isn't much difference between test pipes. They really are just straight pipes. Compare the materials used though. Some use better stainless steel.

As far as performance, there won't be any difference regardless of brands. I would consider resonated test pipes, to cut down on the rasp. Adding a resonator in no way effects performance, other than sound.

Rhett · 07-05-2010, 01:16 AM

Quote:

Originally Posted by efuseakay

I have ERZ HFCs on my G37 sedan. Love them. They were raspy with the stock exhaust, but once I installed my Fast Intentions system, the rasp totally disappeared.

There really isn't much difference between test pipes. They really are just straight pipes. Compare the materials used though. Some use better stainless steel.

As far as performance, there won't be any difference regardless of brands. I would consider resonated test pipes, to cut down on the rasp. Adding a resonator in no way effects performance, other than sound.

Thanks! But, some people inclduing Chris says that resonated test pipes give better numbers in performance than the HFCs. Now, I am a little confusing.

XwChriswX · 07-05-2010, 03:58 AM

Quote:

Originally Posted by Rhett

Thanks! But, some people inclduing Chris says that resonated test pipes give better numbers in performance than the HFCs. Now, I am a little confusing.

What he means by it not affecting performance is that adding a resonator won't Detract from your performance. Even though an HFC doesn't have as big a Cat Cell as a stock cat, it still does have something the gasses have to pass through. So some performance will be lost. Resonated or non-resonated test pipes have Nothing in the way to block the gasses. Free-er flow = more performance.

Rhett · 07-05-2010, 12:43 PM

Quote:

Originally Posted by XwChriswX

What he means by it not affecting performance is that adding a resonator won't Detract from your performance. Even though an HFC doesn't have as big a Cat Cell as a stock cat, it still does have something the gasses have to pass through. So some performance will be lost. Resonated or non-resonated test pipes have Nothing in the way to block the gasses. Free-er flow = more performance.

Thanks a lot, Chris!

BTW why are some people excited by the HFCs even though some performance may be lost? Only reason is to get rasp sound from the HFCs with lower cost?

efuseakay · 07-05-2010, 11:09 AM

Quote:

Originally Posted by Rhett

Thanks! But, some people inclduing Chris says that resonated test pipes give better numbers in performance than the HFCs. Now, I am a little confusing.

Ah... yeah between HFC and test pipes, you will get a few more HP out of test pipes. Nothing you'd really notice though.

Rhett · 07-05-2010, 12:44 PM

Quote:

Originally Posted by efuseakay

Ah... yeah between HFC and test pipes, you will get a few more HP out of test pipes. Nothing you'd really notice though.

Thanks for a note! ^^

Westwood · 07-05-2010, 03:26 PM

edit: sorry wrong thread

OhYeah · 07-06-2010, 12:05 AM

what is the different between w/ 12" Resonators w/ 18" Resonators
just a sound? which one is louder? What about the performance? any power gain or loss?

and what is O2bung, what is it use for? and what does it mean polished by stainless?
Any different from the normal one?? Does the carbon fiber give different sound from the normal one or just the look??

Westwood · 07-06-2010, 08:29 AM

Quote:

Originally Posted by OhYeah

what is the different between w/ 12" Resonators w/ 18" Resonators
just a sound? which one is louder? What about the performance? any power gain or loss?

and what is O2bung, what is it use for? and what does it mean polished by stainless?
Any different from the normal one?? Does the carbon fiber give different sound from the normal one or just the look??

FI 12" with test pipes will be the loudest + more gains. thats the combo im getting

and the Carbon finish is for esthetic's only.

m4a1mustang · 07-06-2010, 08:34 AM

There is NO performance difference between 12" or 18" resonators. The resonators only affect sound volume.

Westwood · 07-06-2010, 02:54 PM

Quote:

Originally Posted by m4a1mustang

There is NO performance difference between 12" or 18" resonators. The resonators only affect sound volume.

thats what i said 12" = loudest

+tp = best gains. i was looking at the dyno sheets and test pipes have a few more hp compared to the sheet with hfc's

nolan1016 · 07-06-2010, 03:30 PM

Quote:

Originally Posted by Westwood

thats what i said 12" = loudest

+tp = best gains. i was looking at the dyno sheets and test pipes have a few more hp compared to the sheet with hfc's

non resonated would be louder then 12", if thats what you meant.

07-04-2010, 09:19 AM	#1 (permalink)
Justin1686 Track Member Join Date: Apr 2009 Location: Nassau, NY Age: 39 Posts: 689 Drives: 09 370 PG AT Rep Power: 19	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, 11:25 AM	#3 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6964	That's just the angle of that video. FI uses two angled cannisters, not one single center mounted muffler. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

07-05-2010, 03:26 PM	#10 (permalink)
Westwood Track Member Join Date: Feb 2010 Location: Ottawa,Canada Posts: 745 Drives: C63 AMG Rep Power: 18	edit: sorry wrong thread __________________ Mods: Stillen G3 \| Stillen lightweight crank pulley \| Berk hfc's \| Top speed pro 1 CBE \| Jic Magic y pipe \| 20" Vossen 9.5/10.5 \| Megan Coilovers \| Smoked JDM tail lights \| Blacked out headlights \| Sprint booster \| Shine Auto CF Front/Rear lip kit \| Evor R CF Side blades,CF fang cover,CF Nose Audio: Kenwood Excelon DNX9960 \| JL 1000w \| JL 12W6v2 Last edited by Westwood; 07-05-2010 at 05:56 PM.

07-06-2010, 12:05 AM	#11 (permalink)
OhYeah Base Member Join Date: Jan 2010 Location: Thailand Posts: 79 Drives: 370z 40th Rep Power: 17	what is the different between w/ 12" Resonators w/ 18" Resonators just a sound? which one is louder? What about the performance? any power gain or loss? and what is O2bung, what is it use for? and what does it mean polished by stainless? Any different from the normal one?? Does the carbon fiber give different sound from the normal one or just the look?? Last edited by OhYeah; 07-06-2010 at 12:13 AM.

07-06-2010, 08:34 AM	#13 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6964	There is NO performance difference between 12" or 18" resonators. The resonators only affect sound volume. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

07-04-2010, 11:17 AM	#2 (permalink)
OhYeah Base Member Join Date: Jan 2010 Location: Thailand Posts: 79 Drives: 370z 40th Rep Power: 17	why, muffler is not at the center of the car?? Is it Error during installation or production?? YouTube - Fast Intentions Exhaust w/ 12" Resonators - 370Z

07-04-2010, 09:18 PM	#4 (permalink)
efuseakay Enthusiast Member Join Date: Mar 2010 Location: The DAYNGA ZONE! Posts: 404 Drives: 2010 G37xS Sedan Rep Power: 17	I have ERZ HFCs on my G37 sedan. Love them. They were raspy with the stock exhaust, but once I installed my Fast Intentions system, the rasp totally disappeared. There really isn't much difference between test pipes. They really are just straight pipes. Compare the materials used though. Some use better stainless steel. As far as performance, there won't be any difference regardless of brands. I would consider resonated test pipes, to cut down on the rasp. Adding a resonator in no way effects performance, other than sound.

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