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Old 01-01-2007, 02:30 PM   #1
Scooby Newbie
Member#: 53434
Join Date: Jan 2004
Post Whistling Noise After Installing DP

What is the loud whistling noise that occurs under load? Not heard while idling. Only slightly loud while low reving in place. Is that the turbo noise thru the DP? Anybody know or can shed some light? Does it happens to all DPs!
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Old 01-01-2007, 02:55 PM   #2
Scooby Specialist
Member#: 44422
Join Date: Sep 2003
Chapter/Region: SWIC
Location: Gilbert, AZ
2005 LGT


An aftermarket DP really wakes up the turbo sound. If you don't have any leaks, thats all it is. Enjoy!
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Old 01-01-2007, 04:22 PM   #3
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Member#: 78074
Join Date: Dec 2004
Chapter/Region: MAIC
Location: NoVA
2005 STi
Aspen White


what he said ^

what downpipe is it and if u run just downpipe and rev it or do a few WOT runs , it sounds real nice
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Old 01-02-2007, 12:35 AM   #4
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Member#: 118016
Join Date: Jun 2006
Chapter/Region: MAIC
Location: Pittsburgh, PA
2004 WRX


Yea, like they said.. Downpipe makes the turbo loud, and it sounds great. Reminds me of a huge truck when it really gets going.
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Old 01-02-2007, 01:32 AM   #5
hybrid gti 2
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Location: (818) 200k+ ej205 ppg 5mt
02 vf30 pnp wagon
silver and cf


check your uppipe as well for good measure.
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Old 01-02-2007, 10:47 AM   #6
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Join Date: Jan 2004

Thanks guys... seems like the noise is ok and not as loud anymore. It's a Cobb DP. No uppipe yet.
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Old 01-02-2007, 10:55 AM   #7
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Member#: 123641
Join Date: Aug 2006
Chapter/Region: MWSOC
Location: Cincinnati, OH
'04 WRX Wagon
Platinum Dirty Metallic


Originally Posted by hybrid gti 2 View Post
check your uppipe as well for good measure.
^^yes. unless you have an STI or an 06 or later (i'm assuming you have some kind of turbo impreza here but you should really fill out your profile) then you have an up-pipe cat. And sometimes, when adding aftermarket modifications to your car, and sometimes even NOT, this up-pipe cat likes to let little peices of itself fly into your turbo. So you might want to take care of this:
Originally Posted by i-max View Post
No uppipe yet.
--soon, you can either gut your stock up-pipe, or buy an aftermarket one, that is if you DO have a up-pipe cat--otherwise an aftermarket up-pipe would be in vain.
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Old 01-02-2007, 11:54 AM   #8
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Chapter/Region: South East
Location: East TN


Loud noise is definitely normal...
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Old 01-02-2007, 07:57 PM   #9
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Chapter/Region: MAIC
Location: Goodview, VA-SML
05 Baja Regal Blue
03 WRX Little Red Wagon


Not if you use a divorce DP with all the stock heatshields. No whistling allowed while driving.
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