Who makes the best HFC's without rasp?

Nikon FM · 02-08-2010, 12:19 AM

The 18" resonators will provide some lower frequency noise reduction over the 12". The CF is a different build (material and modal response) than the SS and just responds a little differently so there is most likely a subtle sound difference. I've only driven mine two days but am liking what I hear.

Nitex · 02-08-2010, 09:46 AM

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 : (

Nikon FM · 02-08-2010, 08:37 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, 04:27 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!

drisko · 02-08-2010, 01:56 PM

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.

F.I. Inc. · 02-08-2010, 01:59 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, 02:03 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.

F.I. Inc. · 02-08-2010, 02:18 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.

Zsteve · 02-08-2010, 11:22 AM

Quote:

Originally Posted by SophiaZ

Yea, the F.I. system is what I want; exhaust, and HFC's....but which would be better in terms of loudness/tone...12'' or the 18"?

Dont forget you can get the resonated HFCs from FI too, I dont know if that will help stop the rasp or not but combined with the CBE resonators that should keep it more quiet than those without the HFC resonators. I thought about theirs but the price is too steep for me so I will be going ERZ HFCs combined with my FI CBE. Should sound good. With the way my FI CBE with 12 resonators sounds right now, which is about perfect, not too loud but loud enough that it gets noticed and no rasp, if you go FI CBE 12 resonaotrs and FI resonated HFCs you will like the sound as it should be loud but not ricer loud.

F.I. Inc. · 02-08-2010, 11:44 AM

Quote:

Originally Posted by Zsteve

Dont forget you can get the resonated HFCs from FI too, I dont know if that will help stop the rasp or not but combined with the CBE resonators that should keep it more quiet than those without the HFC resonators. I thought about theirs but the price is too steep for me so I will be going ERZ HFCs combined with my FI CBE. Should sound good. With the way my FI CBE with 12 resonators sounds right now, which is about perfect, not too loud but loud enough that it gets noticed and no rasp, if you go FI CBE 12 resonaotrs and FI resonated HFCs you will like the sound as it should be loud but not ricer loud.

Be careful going with a HFC that uses a 200 cell cat. They are less restrictive and will be LOUDER than ours. I know that ours are more expensive but when you first came to me you told me that you wanted the quietest option available. Our resonated high flow cats are it. In the end whatever you decide to go with, I do hope that it works for you. I just wanted to put my 2 cents in...

Thanks, Tony

Zsteve · 02-08-2010, 11:57 AM

Quote:

Originally Posted by F.I. Inc.

Be careful going with a HFC that uses a 200 cell cat. They are less restrictive and will be LOUDER than ours. I know that ours are more expensive but when you first came to me you told me that you wanted the quietest option available. Our resonated high flow cats are it. In the end whatever you decide to go with, I do hope that it works for you. I just wanted to put my 2 cents in...

Thanks, Tony

No problem, I dont want too loud (which is why I wont do test pipes or LTHs) but I dont want too expensive either. For me price is at the top of the priority list with performance and quality. Id love to have the res HFC but its just too steep for me for the gains. Love the CBE tho.

F.I. Inc. · 02-08-2010, 12:06 PM

Quote:

Originally Posted by Zsteve

No problem, I dont want too loud (which is why I wont do test pipes or LTHs) but I dont want too expensive either. For me price is at the top of the priority list with performance and quality. Id love to have the res HFC but its just too steep for me for the gains. Love the CBE tho.

If the money is the top priority then go with just a high flow cats. They are $120 less than the res. HFC's...

Thanks, Tony

F.I. Inc. · 02-08-2010, 11:41 AM

Quote:

Originally Posted by SophiaZ

I have the Stillen HFC's and they took away back pressure and that left me with a hiss. I've seen on the Fast Intentions site for their HFC's and that said they free up back pressure. Can anyone say that their's don't have that hiss? I'm going to get the F.I. exhaust but want to make sure that both the exhaust and HFC's would be better than my set up now. Any help would be appreciated.

Since you stated that you plan on going with our exhaust system I have a recommendation. If you really want to keep a HFC of some sort but want to cut down on the hiss during deceleration here is what I recommend.

First and foremost go with our stainless steel muffler option and 18" resonators in the x pipe itself. As far as the high flow cats, ours are 300 cell just like the Berk as well as Stillen. However, we offer a resonated high flow cat that no one else does. What this does is give you a high flow cat and resonated test pipes all in one. The beauty is, they do not make any less power than our 300 cell high flow cats. The resonator is straight through perforated core and in my opinion will help cut down that hiss that you are hearing.

It is there even when the exhaust is stock and if you listen real closely you can hear it ever so faint that it is. By removing the stock cats which use higher cell count cores and thicker exterior material, you eliminate what is absorbing most of that sound. All of the HFC's on the market are less restrictive than stock and much lighter because we use thinner wall tubing. This is why this sound becomes so much prevalent.

If you have any questions, please do not hesitate to ask...

Thank you, Tony

370Zsteve · 02-08-2010, 12:17 PM

Quote:

Originally Posted by F.I. Inc.

Since you stated that you plan on going with our exhaust system I have a recommendation. If you really want to keep a HFC of some sort but want to cut down on the hiss during deceleration here is what I recommend.

First and foremost go with our stainless steel muffler option and 18" resonators in the x pipe itself. As far as the high flow cats, ours are 300 cell just like the Berk as well as Stillen. However, we offer a resonated high flow cat that no one else does. What this does is give you a high flow cat and resonated test pipes all in one. The beauty is, they do not make any less power than our 300 cell high flow cats. The resonator is straight through perforated core and in my opinion will help cut down that hiss that you are hearing.

It is there even when the exhaust is stock and if you listen real closely you can hear it ever so faint that it is. By removing the stock cats which use higher cell count cores and thicker exterior material, you eliminate what is absorbing most of that sound. All of the HFC's on the market are less restrictive than stock and much lighter because we use thinner wall tubing. This is why this sound becomes so much prevalent.

If you have any questions, please do not hesitate to ask...

Thank you, Tony

Thanks for the info, clears up quite a bit of questions for me!

SophiaZ · 02-08-2010, 01:14 PM

Quote:

Originally Posted by F.I. Inc.

Since you stated that you plan on going with our exhaust system I have a recommendation. If you really want to keep a HFC of some sort but want to cut down on the hiss during deceleration here is what I recommend.

First and foremost go with our stainless steel muffler option and 18" resonators in the x pipe itself. As far as the high flow cats, ours are 300 cell just like the Berk as well as Stillen. However, we offer a resonated high flow cat that no one else does. What this does is give you a high flow cat and resonated test pipes all in one. The beauty is, they do not make any less power than our 300 cell high flow cats. The resonator is straight through perforated core and in my opinion will help cut down that hiss that you are hearing.

It is there even when the exhaust is stock and if you listen real closely you can hear it ever so faint that it is. By removing the stock cats which use higher cell count cores and thicker exterior material, you eliminate what is absorbing most of that sound. All of the HFC's on the market are less restrictive than stock and much lighter because we use thinner wall tubing. This is why this sound becomes so much prevalent.

If you have any questions, please do not hesitate to ask...

Thank you, Tony

Thanks, Tony for all that information! But which would be better as far as the deep tone: the res. HFC or the regular HFC? I want to cut down on the hiss but I'd like a nice deep tone too if that's possible. If there isn't a way to do that than maybe I'll just deal with that hiss.

02-08-2010, 12:19 AM	#1 (permalink)
Nikon FM Track Member Join Date: Jan 2009 Location: Snoqualmie WA Posts: 973 Drives: 03 996TT Porsche Rep Power: 607	The 18" resonators will provide some lower frequency noise reduction over the 12". The CF is a different build (material and modal response) than the SS and just responds a little differently so there is most likely a subtle sound difference. I've only driven mine two days but am liking what I hear. __________________ Buddy Revell: "One man's sooner is another man's later"

02-08-2010, 09:46 AM	#2 (permalink)
Nitex Track Member Join Date: Jan 2010 Location: Seattle Posts: 848 Drives: '13 GTI Stage 2 UNI Rep Power: 17	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 : ( miniZilla likes this.

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02-08-2010, 01:56 PM	#5 (permalink)
drisko Base Member Join Date: Jan 2009 Location: So Cal Age: 44 Posts: 160 Drives: 09 370Z PW Tour S 6M Rep Power: 17	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.