Who makes the best HFC's without rasp?

F.I. Inc. · 02-08-2010, 02:58 PM

Quote:

Originally Posted by SophiaZ

Also..for the res HFC, placing my order for them it says pick one Extra O2 bung: passenger, driver, or both pipes. What are these 02 bungs?

Passenger side first, to the best of my knowledge it runs leaner of the two banks on this car. However, when in doubt run two.

F.I. Inc. · 02-08-2010, 02:59 PM

Quote:

Originally Posted by drisko

One other thing you also might want to consider is whether or not the HFC will give a CEL. I have had the F.I. HFCs on for about 8000 miles now and not a single CEL.

Hey bud, hope that all is well.

Look at that, 8000 miles and no CEL. I do not expect you to get one in 8000 more...

Tony

spearfish25 · 02-08-2010, 03:03 PM

Quote:

Originally Posted by SophiaZ

Also..for the res HFC, placing my order for them it says pick one Extra O2 bung: passenger, driver, or both pipes. What are these 02 bungs?

Extra bungs are placed before the cat core and are used for wide-band tuning. You may never need them.

Quote:

Originally Posted by drisko

One other thing you also might want to consider is whether or not the HFC will give a CEL. I have had the F.I. HFCs on for about 8000 miles now and not a single CEL.

There are plenty of threads about this. The more of a brand's HFCs that are out there, the more likely you are to hear about CELs. Berk has probably sold the most to our community and theirs have the most CEL reports. ERZ has only sold a couple to a few of us on here, and there haven't been any CELs. FI hasn't outfitted that many of our 370Z community members, so the numbers are still relatively low to get a good feel for CELs. They make nice products with a lot of R&D though, so I imagine they've done their homework in preventing CELs. Good to know that 8k miles are CEL free for you.

m4a1mustang · 02-08-2010, 03:05 PM

Sophia you are going to LOVE the sound!

F.I. Inc. · 02-08-2010, 03:18 PM

Quote:

Originally Posted by spearfish25

FI hasn't outfitted that many of our 370Z community members, so the numbers are still relatively low to get a good feel for CELs. They make nice products with a lot of R&D though, so I imagine they've done their homework in preventing CELs. Good to know that 8k miles are CEL free for you.

Actually we have sold somewhere between 50-70 sets of HFC for the 370Z. If you include the G37 as well as HR 350Z we have sold hundreds of sets. Those cars are different than the 370 but the engine is virtually the same. What I am getting at is that we have plenty out there.

Red370 · 02-08-2010, 03:28 PM

speaking of cats, i got a CEL a bit ago thats been off and on intermittent, I'm going to try the steel wool trick and see if that works, how much of it should I use? should I pack in as much as possible, or just a pinch or two?

NYBladeZ · 02-08-2010, 03:45 PM

Bought GTM test pipes off a forum member, had the L stem for the sensor, great sound no cel, but you will get a smell in the cabin. I think the rasp is primarily caused from a 2.5 HFC/TP going into a less than 2.5" y-pipe.

SophiaZ · 02-08-2010, 05:07 PM

So it won't hurt to get both 02 bungs? I should just get them to be safe I guess

CrownR426 · 02-08-2010, 05:13 PM

I make the best HFC's without rasp!

NYBladeZ · 02-08-2010, 07:01 PM

Quote:

Originally Posted by SophiaZ

So it won't hurt to get both 02 bungs? I should just get them to be safe I guess

Nah won't hurt, I just didn't think they were necessary though if I throw a CEL i'll rescind this statement.

Nikon FM · 02-08-2010, 09:37 PM

Quote:

Originally Posted by Nitex

Off topic, but i see your from snoqualmie Nikon! I just moved from Everett few months ago, i used to ride stevens, baker, and snoqualmie! Anyways your picture reminds me of all the trees! we don't have them down here in Texas : (

I like to trail run................the trees are what makes this place amazing .....oh that and the mountains

I'd really find it difficult to move and would do everything I could to stay here.

On topic: To the OP, sound quality is so personally based because your decision will be based on how you imagine the system will sound versus what the system will sound like in reality. If you want strong (friggen loud) low frequency go with minimal treatment ...(12" CF and no resonators). If you want some low frequency sound increase without rasp go with treated resonated HFCs and CF resonators...12" or 18" will affect how much low frequency noise is attenuated. The 18" will attenuate the lowest frequency noise over the 12". The quietest solution would be resonated HFC and 18" stainless resonators.

Have fun!

SophiaZ · 02-09-2010, 05:27 PM

Quote:

Originally Posted by Nikon FM

I like to trail run................the trees are what makes this place amazing .....oh that and the mountains

I'd really find it difficult to move and would do everything I could to stay here.

On topic: To the OP, sound quality is so personally based because your decision will be based on how you imagine the system will sound versus what the system will sound like in reality. If you want strong (friggen loud) low frequency go with minimal treatment ...(12" CF and no resonators). If you want some low frequency sound increase without rasp go with treated resonated HFCs and CF resonators...12" or 18" will affect how much low frequency noise is attenuated. The 18" will attenuate the lowest frequency noise over the 12". The quietest solution would be resonated HFC and 18" stainless resonators.

Have fun!

Thanks for that!

Zoom370z · 02-14-2016, 01:23 PM

Has anyone heard the erz or berks or fast intentions hfc's in person? I'm looking for something deep and very loud and I don't care about the rasp.

Zoom370z · 02-14-2016, 01:44 PM

Hey rasp is kinda good ! Lol hey sophia we are on the same boat ... I'm also looking for a hfc's but I want mine loud lol

02-08-2010, 03:05 PM	#34 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	Sophia you are going to LOVE the sound! __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

02-08-2010, 03:28 PM	#36 (permalink)
Red370 A True Z Fanatic Join Date: Jul 2009 Location: Kaiserslautern, Germany Posts: 4,391 Drives: your mom to church Rep Power: 296	speaking of cats, i got a CEL a bit ago thats been off and on intermittent, I'm going to try the steel wool trick and see if that works, how much of it should I use? should I pack in as much as possible, or just a pinch or two? __________________ 2011 Mustang 5.0 \| 3.55's \| Lethal Performance off road H-Pipe \| Magnaflow Muffler Delete \| JLT CAI/Bama tuned 417whp/ 404 ft/lbs

02-08-2010, 03:45 PM	#37 (permalink)
NYBladeZ A True Z Fanatic Join Date: Apr 2009 Location: New York Posts: 2,158 Drives: Lotus Exige S Rep Power: 20	Bought GTM test pipes off a forum member, had the L stem for the sensor, great sound no cel, but you will get a smell in the cabin. I think the rasp is primarily caused from a 2.5 HFC/TP going into a less than 2.5" y-pipe. __________________ 2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling

02-08-2010, 05:13 PM	#39 (permalink)
CrownR426 A True Z Fanatic Join Date: Nov 2008 Location: South Korea Posts: 4,676 Drives: Manual Rep Power: 848	I make the best HFC's without rasp! __________________ Love + Hardwork + Passion RIP SVTRacer

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02-08-2010, 05:07 PM	#38 (permalink)
SophiaZ A True Z Fanatic Join Date: Dec 2009 Location: South Jersey Posts: 1,463 Drives: 2020 50th anniv 7AT Rep Power: 6733	So it won't hurt to get both 02 bungs? I should just get them to be safe I guess

02-14-2016, 01:23 PM	#43 (permalink)
Zoom370z Enthusiast Member Join Date: May 2014 Location: Lincoln ca Posts: 308 Drives: 2011 370z auto 7 Rep Power: 11	Has anyone heard the erz or berks or fast intentions hfc's in person? I'm looking for something deep and very loud and I don't care about the rasp.

02-14-2016, 01:44 PM	#44 (permalink)
Zoom370z Enthusiast Member Join Date: May 2014 Location: Lincoln ca Posts: 308 Drives: 2011 370z auto 7 Rep Power: 11	Hey rasp is kinda good ! Lol hey sophia we are on the same boat ... I'm also looking for a hfc's but I want mine loud lol