Registered User
ya you have to listen for it but it sounds like what we have all been talking about if there is a way out im going for it otherwise i might do away with the pipes all together an just stick with an exhaust i dont know its annoying i hope a solution is found
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Listen to that clip...
That buzzin sound you hear...guess what? Its a 'de-tuned' version of a rasp. No matter what, any hi-flowing cat will rasp due to the more free-flowing air. Unless some1 can build a test-pipe with the largest and longest resonator, guess what, you will get some form of rasp regardless. If FI couldn't do it, I guess no1 can.
yea....thats the noise but its accompanied by a rattle. it occurs as the RPM's come down.(ie: 2600-2800 rpm +/-) its that ZZZzzzzz noise.Originally Posted by chilibowl
http://youtube.com/watch?v=Bfbya24T_jUListen to that clip...
That buzzin sound you hear...guess what? Its a 'de-tuned' version of a rasp. No matter what, any hi-flowing cat will rasp due to the more free-flowing air. Unless some1 can build a test-pipe with the largest and longest resonator, guess what, you will get some form of rasp regardless. If FI couldn't do it, I guess no1 can.
Rick....can you confirm this noise & provide us with your opinion
Registered User
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where did the noise come from? the cat area? or the muffler area of the car?Originally Posted by Ralph0064
I agree with Calvin. I love my cats but that darn noise is embarrassing. The thing is that, my evo 2 only has a flex joint on the passenger side. so the theory rick has about the noise coming from the flex joints isnt neccessarily 100% correct. Ive had someone in the car up on the lift at work revving it up and the noise is most pronounced on the drivers side where there is no flex joint for the y-pipe. everything is tight & no exhaust leaks were found.
Registered User
i just listened to that clip - and the noise im hearing is not present.....i may have a seperate problem =\ its more of a loud aluminum rattle almost as if my liscense plate was rattleing - and its about 1-2 seconds long
i wouldnt call it a rattle...i wish i had time to make and upload some sound clips for you guys...but my car is 1/4 mile from where i live and it's frickin 40 something degrees here...and it's getting colder 
perhaps ralph or someone else would be kind enough to take some time to make some clips of this sound
perhaps ralph or someone else would be kind enough to take some time to make some clips of this sound
Registered User
id have them up by now, but my car is in the shop until the weekend. =\
Lexus IS350
Ill try and make a video clip tomorrow afternoon. No promises tho...
Registered User
Quote:
Yea - from that clip it definitely sounds like rasp. the other noise you likely hear following it is very likely vibration/resonance from it.Originally Posted by Ralph0064
Rick....can you confirm this noise & provide us with your opinion
When you change the fundamental tuning characteristics of an exhaust system, by adding TP's or HFC's - you will be subject to a number of possible issues likes this. The systems are designed to work with stock cats and no headers...whether they work or not is irrelevant. systems are designed on stock cars otherwise. This 'noise' is also not only happening with FI TP's and HFC's. Listen closely to other clips of countless cars on this and the 350Z forum...once most people add these to their cars - rasp is inherent immediately.
Not to 'sell' at all...but these sounds don't seem to be present when the TP's and HFC's are coupled with our Intimidator system. This system was specifically designed to to work together properly. You'll also notice that, and far as I know, there aren't any other companies out there supplying a catback and HFC's and TP's all designed to work together...
Rick
Lexus IS350
Didnt get a chance to make a video clip, Ill try and get it up tomorrow
Registered User
The rattle is coming from the hfc bouncing off the heat shields. I had the same problem with mine. I put my car on the lift and had someone rev it for me. I saw what was happening and removed the heat shield between the hfc and underbody(very simple fix). This is because they can be a tight fit and are pushed against the sides of the under carage. I guess it is hard to mimick oem. Once the heat shield is removed, the rattle will be cured, BUT the hissing will remain. I can't figure out what the problem is. I believe it is the mesh inside the pipes. I will let you know if I figure it out.
the problem was never rattling. not for the op and myself at least.
Registered User
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yes mine too...it was the heat shield...so i'm planning on take it off and wrap the HFC with header wrap to protect under the car from the heat.Originally Posted by camg356mt
The rattle is coming from the hfc bouncing off the heat shields. I had the same problem with mine. I put my car on the lift and had someone rev it for me. I saw what was happening and removed the heat shield between the hfc and underbody(very simple fix). This is because they can be a tight fit and are pushed against the sides of the under carage. I guess it is hard to mimick oem. Once the heat shield is removed, the rattle will be cured, BUT the hissing will remain. I can't figure out what the problem is. I believe it is the mesh inside the pipes. I will let you know if I figure it out.
the sound is hardly noticeable...almost gone...with my hks.
and no, it's not because the hks is louder -__-
and no, it's not because the hks is louder -__-