KingNasGS4

iTrader: (22)

I notice with my 400, when pressing some gas, I hear a "vssss"

I tried to capture this in a video but I'm not sure how well my phone captured the sound.
I'm very sorry I dont know how to embed on this forum.. If someone else can do it for me, thanks but this is the best I can do
http://youtu.be/wYbFSJadOsU

Does this contribute to any loss in performance? is it an exhaust leak? Let me know what you think guys

KingNasGS4

iTrader: (22)

I also forgot to mention that the sound is coming from mainly under the front end of the car like the underside of the where the gear shifter is.

I took the car to an exhaust guy, and he did some welding where he thought the leak was.

But I still hear it. That's why I'm asking it its normal.

SorrGwa

iTrader: (1)

if u have access to hoist, when the car is somewhat cold, hit ur exhaust pipe with your palm, see if u hear anything, most likely if stock exhaust, the metal shielding that forms around the exhaust has broke loose or even the heat shielding itself is loose.

AYEmike

i get that noise from 1-2.5k rpm but im straight pipe.

Busha

It sounds more like a alternator wining noise to me

KingNasGS4

iTrader: (22)

Definitely not alternator. Its the sound of a whoosh of air right after letting go of the gas pedal.

And its not heat shield either. its a sound of air. Unless the heat shield makes an air sound

ninja6o4

iTrader: (6)

you got a leak somewhere. mine doesn't sound like that and I'm all stock exhaust.

KingNasGS4

iTrader: (22)

I just was watching another member show his Borla off on his 400 and I hear the same kind of noise. Im not sure if that is a coincidence that he has the same exhaust leak, or if its just normal.

I will look through the exhaust clip thread for the V8 engines to see if I hear it there.