the rasp is pretty common. i had berk hfc's on my g35 and i had the same issue. i also had a weird hiss noise on the revdown at about 2500rpm. it sounded like a rattle but it had to do with the difference in airflow i believe...ive heard much worse! i think the benefits outweigh the slight rasp though. they give that deep burble the VQ's are known for and they definitely give you moar powahhhh!!

Just ordered the Berk HFCs.. Hopefully I can live with whatever noise it produce. Otherwise the Fi Cbe will be the next mod.

I don't know where you're at in the Seattle area, but my Nismo currently has only the Berk HFCs installed. FI CBE is on order. If you want to hear it, we can set up a time and place to meet up. I never see other Nismos around here (I think I've seen one other in my life); wouldn't mind seeing one of my brothers! :D

Most definitely we should meet up! The person I bought my Nismo from had Zports in Everette modify the stock exhaust. Its pretty crazy lookin but I likey cuz its unique.

I just installed the Berk HFC and wow! It's sounds amazing. When cold I hear a little hissing but when its up to operating temp. No hissing or rasp whatsoever. I revved the engine fast and hard and nothin... Took it and open her up and sounds awesome. Instead of dumping $1200 on Fi Cbe. I'm gonna get the Lth headers instead for now...:driving:

You may know this, but keep in mind three things...

1) Long-tube headers eliminate the cats, so your $$ spent on the HFCs would be lost unless you could recoup the cost via resale.

2) LTHs are a difficult install to do yourself.

3) If you buy the headers and pay a shop to install them, you'll likely spend more than $1200.

It definitely sounds badass, though.

Yeah I was weighing out the idea. I figured if I sell those Hfc at a good price I should be able to get rid of it quick. When i installed them i tried hard not to put a scratch on them and wiped it down before starting the car.
Then for a second I thought I might have that rasp or loud hiss that everyone has been complaining about which I don't want. Also reading through some threads. It looks like the stocks manifolds do a really good job as it is.
I have some new tires on the way and so ill have some time to think about which way to go while I'm saving up. If I end up just running the stock manifolds then my next mod will be my tein suspension setup.
Decisions... Decisions... Decisions...:confused:

I have the FI test pipes and the stock Nismo exhaust and mine makes that sound and its annoying! I am hoping when FI installs my new exhaust it goes away! Mine is louder then yours and sounds like loose metal in the pipes. Has anyone changed their exhaust and notice it go away? That is what i am hoping for! Or I might go back to stock.

Just my 2c, I had the following experiences:

1. stock nismo cbe / stock cats - no hiss
2. stock nismo cbe / berk hfc - very noticeable hiss
3. FI cbe (18") / berk hfc - still very noticeable hiss, maybe louder maybe not hard to tell with exhaust on there
4. FI cbe (18") / stock cats - very very minor hiss, probably wouldn't notice if i wasn't listening for it

So in my experience the HFC was really the culprit.. There have been new HFC's that are resonated i've been thinking about trying that may reduce the hiss while still giving some more gains...but for now i'm extremely happy with the sound of FI cbe + stock cats (DD).

We're out here.
 

Sup just so you both know (Redmond n Port) there is about ten nismos running around. A handful are in PNW_INC were on Facebook. We do meets and cruises around the pacific north west.



QUOTE=KingJoseph;1973026]I don't know where you're at in the Seattle area, but my Nismo currently has only the Berk HFCs installed. FI CBE is on order. If you want to hear it, we can set up a time and place to meet up. I never see other Nismos around here (I think I've seen one other in my life); wouldn't mind seeing one of my brothers! :D[/QUOTE]

My FI test pipes have the 18" res. on them.. still very loud Metal sounding hiss. Maybe I will call Tony and talk to him, he should know.

I'm just as lucky as you. Only slight hiss I hear is when vehicle is cold during low rpm acceleration. When car warms up I hear nothing. As I accelerate only noise heard is a large amount of air rushing through the intake just like Fuct stated. No loud rattling Or rasp noise like mention by most here. I'm gonna keep my fingers crossed since I only have about 300 miles since the HFC installed. So far, love the low growling as I'm cruising down the highway.:driving:

Just listened to ur sound clip and yeah that is awful. If mines made that noise then I would be annoyed too.. I hope it goes away soon for you...

UPDATE!!

Just talked to the guys at FI. From what they told me is the Nismo Exhaust is not built to take that much air. The Test Pipes or even the HFC are allowing more airflow through the Nismo exhaust and it will create that sound. He said once I get their exhaust installed it will eliminate the sound. They said i will still have a small hiss from letting off the gas but it wont be the Rasp that we hear now. Just thought you all wanted to know.

Thx for the update AH..

Installed the STillen g3 intakes and Berk HFC on the Nis this weekend. What a big difference over stock, love the sound and the car comes alive at 4k rpms. More so then before. Unfortunately I Do have the Rasp :( But I mostly here it when powering thru first and then can't really hear it thru the other gears.
Hopefully it will go away in time or I might have to upgrade the CBE. But I like the sound, hopefully the rasp will go away.

The Berk HFC steel is rather thin. Some have complained of a metallic noise.

i had CNT test pipes (POS broke last year) and never had a rasp w my factory nismo exhaust..... just that deceleration hiss.

I installed the FI CBE after the Berk HFCs, and the rasp is gone. All there is now is the hiss which I have grown to like.

Sure am glad to hear the FI CBE takes care of the rasp! My Berk HFC should be here in a couple days but the exhaust wont be here for 3 more months.......and I'm just not patient enough to wait 3 months to see that HFC sitting around my garage. If it's here...it must be installed...I think I can handle a little rasp for 3 months.

I found this sound clip and thought of this thread. I'm currently very satisfied with the way my exhaust sounds except for the slight tinny rasp at 2500 to 3500 rpm.

https://www.youtube.com/watch?v=TVcOclU9UcA