Im taking a pole on how many people with TPs have that wierd noise from the TPs when your rev comes back down. Its supposedly normal but I cant help but think its a problem with installation. Its the wheeze/whistle/rattle sound when the revs come back down from the TPs, not the exhaust. O yea...Please mention if yours is resonated or non resonated.

http://youtube.com/watch?v=NtLYQmArLE8
http://youtube.com/watch?v=jWsaWjZW1PE

 

very normal - you'll get used to it. (If there's ppl around and I'm coming to a stop, I sometimes take it out of gear to let the rpms fall quikcly to minimize the rasp)

-Peter

 

I have the same noise. I have the resonated test pipes. I think its the back pressure of your exhaust.

 

The whislte comes from the flex pipe not having a liner inside of it. If you get some flex pipes with liners in them and put them in place of the old ones that sound will go away.

This one will whistle.


This one will not whistle.


I think all the 350z Y pipes use the ones without liners because they are alot cheaper than the ones with liners, so it lowers the manufactures overhead, that way they save money and still gouge you on the price.

 

Mine don't make any noise but the turbos might be why.

 

Wow, i had no idea that was normal. I thought i had an exhaust leak somewhere. Its sounds like a loud whistle when the revs are winding down.

Well, im glad im not the only one.

 

That's the same noise I have!

 

everything sounds normal to me

 

I don't hear anything out of the ordinary

 

if its around 2k rpm, its the exhaust ground for the exhaust cutout i think.

 

I just installed a GReddy EVOII on my G35 Coupe, and now I have this same exact noise. I have UTR resonated test pipes as well, which were on the car with the stock exhuast. Before I installed the GReddy I didnt have this noise, and I am 100% positive that there is no leaks. So I wonder if its more because of the GReddy or the resonated test pipes? I had a friend rev the car while I was underneath and it sounded like it was coming from somewhere in the area of the Y pipe.

 

I am having a problem with mine as well. I just uploaded two videos of the noise on Youtube. As soon as they are available I will post them as well.

 

Same here

 

Here is what mine are doing. Yours sounds normal to me. Listen to the "squeaking" sound at and under 2k RPM's

http://www.youtube.com/watch?v=Y_FMsIDBusQ

 

yea normal i have non-resonated for about 6 months now...finally got to the piont were i cant take the rattle anymore ...they are coming off tomw and getting thrown in the garbage...now running stock cats with injen ti ses

 

i ripped mine off next day...that annoying sound makes the car sound like ****..and the smell also just wasnt worth it for me

 

he is right...the smell is bad as well as the **** coming out of the exhaust starts to stain the back bumper...not cool

 

That is the exact noise I have.

 

Better clip of the "noise".

http://www.youtube.com/watch?v=Sq6eIQ1z3E8

 

yeap thats a better clip...
i think and aftermarket Y pipe would help!

a friend with an 06 had that noise and then it dissapeared when he switched Y pipe...
he had non res testpipes+stocky+TS exhaust