Welcome to the North American Subaru Impreza Owners Club Sunday April 20, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 04-15-2012, 08:42 PM   #1
SteveH654
Scooby Newbie
 
Member#: 315746
Join Date: Apr 2012
Location: Philadelphia
Vehicle:
2012 Subaru WRX
SWP

Default 2012 Wrx Cnt Exhaust Leak Question

Hey guys, I installed my CNT cbe on my 2012 Wrx today and I seem to be having a exhaust leak... Under full boost i hear a whooshy whistle sound.This was my first time installing one, so I have a couple questions. I purchased the exhaust used and some of the hardware that came with it was kind of suspect. The gaskets were in about 7/10 condition and I used a sealer on each side of all of the gaskets. My first question is there was a ( i think graphite) piece where the flex pipe meets the downpipe that I wasn't sure what to do with it. I left this piece out so maybe thats the issue?(see the below pics) Also, with aftermarket CBE's do you reuse the "spring" bolts that connect the flex pipe to the DP? At this point I think I'm just going to buy new gaskets and hardware and go from there. The spring bolts just didnt seem to be tight enough but maybe it had something to do with not using the graphite piece:

Graphite piece that fits between the DP and flex pipe inside of them
* Registered users of the site do not see these ads.
SteveH654 is offline   Reply With Quote
Old 04-15-2012, 08:47 PM   #2
cablegorilla
Scooby Newbie
 
Member#: 288942
Join Date: Jul 2011
Chapter/Region: NESIC
Location: mass
Vehicle:
2011 wrx premium sed
DGM

Default

that is a donut gasket that goes between the downpipe and the catback. it will absolutely leak without that in place.......
cablegorilla is offline   Reply With Quote
Old 04-15-2012, 08:52 PM   #3
SteveH654
Scooby Newbie
 
Member#: 315746
Join Date: Apr 2012
Location: Philadelphia
Vehicle:
2012 Subaru WRX
SWP

Default

Quote:
Originally Posted by cablegorilla View Post
that is a donut gasket that goes between the downpipe and the catback. it will absolutely leak without that in place.......

yea after researching it a little more i figured this out... thanks though man. At first I actually tried to install it with this but it was almost impossible to do so with the spring bolts?
SteveH654 is offline   Reply With Quote
Old 04-16-2012, 10:34 PM   #4
WRrexu
Scooby Specialist
 
Member#: 217061
Join Date: Jul 2009
Chapter/Region: Tri-State
Vehicle:
2009 Wrx

Default

Do not use spring bolts, go to your local hardware store and get some normal bolts, nuts, washers....
WRrexu is offline   Reply With Quote
Old 04-16-2012, 11:11 PM   #5
edchuck
Scooby Newbie
 
Member#: 265328
Join Date: Nov 2010
Location: exit 100/NJ
Vehicle:
11 STI sedan stg2
WRB

Default

I did not reuse the donut gasket when I stalled my Perrin catback (with a COBB catted DP) on my 2011 sedan. I used the gaskets, nuts, bolts, and washers that came with the exhaust, and there are no leaks.
edchuck is offline   Reply With Quote
Old 04-17-2012, 12:33 AM   #6
cablegorilla
Scooby Newbie
 
Member#: 288942
Join Date: Jul 2011
Chapter/Region: NESIC
Location: mass
Vehicle:
2011 wrx premium sed
DGM

Default

Interesting. I have the factory cat back because I do not want it to be too loud. It's actually louder than I would like haha. Sounds awesome though. I still have a leak at the point where it meets the downpipe and I can't get rid of it. I may have to look into using a flat gasket to seal it up.
cablegorilla is offline   Reply With Quote
Old 04-17-2012, 01:12 AM   #7
Dka67
Scooby Specialist
 
Member#: 296721
Join Date: Oct 2011
Chapter/Region: SCIC
Location: Montebello
Vehicle:
11 5door
SWP

Default

You'll get used to it after a few weeks.
It takes a few months to break'em in. It will sound better after the break in.
Dka67 is offline   Reply With Quote
Old 04-17-2012, 09:38 AM   #8
SteveH654
Scooby Newbie
 
Member#: 315746
Join Date: Apr 2012
Location: Philadelphia
Vehicle:
2012 Subaru WRX
SWP

Default

Quote:
Originally Posted by WRrexu View Post
Do not use spring bolts, go to your local hardware store and get some normal bolts, nuts, washers....

Ok so yesterday i reinstalled the donut gasket with the regular gasket together (with the spring bolts) reapplied some gasket sealer and tightened everything back up and it still seems to make a sort of like whistling or "spooling" sound at like 5000 rpms.the only other questionable thing about the exhaust is the hardware. the bolts that were given to me didnt have washers, they are thick bolts but on some there is a little gap where the bolt goes through the hole on the flange. The nuts however are lock nuts so they have a washer like head to them. I guess Im just going to buy new gaskets and hardware at this point its so frustrating. Will I be able to get the right gasket at say, autozone? Any suggestions for places to buy new hardware also? I'm very close to just having a shop fix it ughhhhhh
SteveH654 is offline   Reply With Quote
Old 04-17-2012, 11:25 AM   #9
Delphi
NASIOC Supporter
 
Member#: 239335
Join Date: Feb 2010
Chapter/Region: W. Canada
Location: Edmonton, Alberta
Vehicle:
2011 WRX
WRB

Default

It is your flex pipe. Had the same problem with my CNT catback. I cut mine out and welded in a pipe. Changed the way the tips point so I had to move it over with some wire. If you are not handy and don't have access to a welder and shop get a muffler shop to fix it for you.


Does that sound like it?
Delphi is offline   Reply With Quote
Old 04-17-2012, 12:45 PM   #10
SteveH654
Scooby Newbie
 
Member#: 315746
Join Date: Apr 2012
Location: Philadelphia
Vehicle:
2012 Subaru WRX
SWP

Default

It kind of does! Im curious to see how it sounds outside of my car because it does not really sound as harsh as that. Ill try to post a video asap maybe that will help diagnose this.
SteveH654 is offline   Reply With Quote
Old 04-17-2012, 12:48 PM   #11
SteveH654
Scooby Newbie
 
Member#: 315746
Join Date: Apr 2012
Location: Philadelphia
Vehicle:
2012 Subaru WRX
SWP

Default

Quote:
Originally Posted by Delphi View Post
It is your flex pipe. Had the same problem with my CNT catback. I cut mine out and welded in a pipe. Changed the way the tips point so I had to move it over with some wire. If you are not handy and don't have access to a welder and shop get a muffler shop to fix it for you.

Perrin Catback Exhaust on 09 WRX Hatchback Whistle - YouTube

Does that sound like it?


Also ,my buddy has the same exhaust as me and I dont think he is having the issue? Im going to have him do a pull in front of me to see if he has it. He does have a cai so it probably masks the noise. Is this all of the cnt's? Or just some? and how much would a shop charge roughly?
SteveH654 is offline   Reply With Quote
Old 04-18-2012, 09:25 AM   #12
SteveH654
Scooby Newbie
 
Member#: 315746
Join Date: Apr 2012
Location: Philadelphia
Vehicle:
2012 Subaru WRX
SWP

Default

Quote:
Originally Posted by Dka67 View Post
You'll get used to it after a few weeks.
It takes a few months to break'em in. It will sound better after the break in.

DKA67, was this directed towards me or to the stock exhaust statement above?
SteveH654 is offline   Reply With Quote
Old 04-18-2012, 10:11 AM   #13
Delphi
NASIOC Supporter
 
Member#: 239335
Join Date: Feb 2010
Chapter/Region: W. Canada
Location: Edmonton, Alberta
Vehicle:
2011 WRX
WRB

Default

No it just seems like CNT had a bad batch with the Flex pipes. Thats all that leaks. I at first asked a shop for a quote and it was 70$. It is literally like 4in of pipe you have to put in. If you get a shop to do it they will make sure your exhaust tips line up for you and you wont have to worry about having to align them yourself like I had to.

Crappy deal I know but for a $500 quad tip catback you can't complain.
Delphi is offline   Reply With Quote
Old 04-18-2012, 01:23 PM   #14
SteveH654
Scooby Newbie
 
Member#: 315746
Join Date: Apr 2012
Location: Philadelphia
Vehicle:
2012 Subaru WRX
SWP

Default

Quote:
Originally Posted by Delphi View Post
No it just seems like CNT had a bad batch with the Flex pipes. Thats all that leaks. I at first asked a shop for a quote and it was 70$. It is literally like 4in of pipe you have to put in. If you get a shop to do it they will make sure your exhaust tips line up for you and you wont have to worry about having to align them yourself like I had to.

Crappy deal I know but for a $500 quad tip catback you can't complain.

So let me get this straight, is the air leaking from the flexp pipe? Or does the flex pipe cause a gap between the flange somwhere? I wonder if some heat wrapping around the flex pipe would fix this?
SteveH654 is offline   Reply With Quote
Old 04-19-2012, 12:53 PM   #15
Delphi
NASIOC Supporter
 
Member#: 239335
Join Date: Feb 2010
Chapter/Region: W. Canada
Location: Edmonton, Alberta
Vehicle:
2011 WRX
WRB

Default

It is exhaust leaking from the flex pipe. The pipe is no good. You can either get a shop to weld in a solid pipe or a flex pipe. The less expensive route would be a solid pipe.
Delphi is offline   Reply With Quote
Old 05-21-2013, 08:49 PM   #16
japan4
Scooby Newbie
 
Member#: 343524
Join Date: Jan 2013
Location: cohoes ny
Vehicle:
2013 wrx limited
dark grey

Default

I know this is an old thread but did you ever resolve this issue? I am having the same problem at the moment. It was weird when I first installed it the exhaust was fine but now after 2k miles I'm having the same problem. It is on when I go WOT, I emailed cnt and their answer......wait for it.....buy their downpipe haha. Other then this issue I love the exhaust and have no complaints. Any help would be much appreciated!
japan4 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
02 WRX Exhaust Leak QUESTION Forleist Built Motor Discussion 6 04-22-2011 10:36 PM
Exhaust leak question -=Ice-T=- Newbies & FAQs 6 10-31-2005 03:58 PM
exhaust leak question..one more time caryfd227 Factory 2.5L Turbo Powertrain 1 01-07-2005 06:31 PM
exhaust leak question GimpWRX Factory 2.0L Turbo Powertrain 4 12-21-2001 01:36 PM
exhaust leak question montgog Normally Aspirated Powertrain 1 08-01-2001 11:05 PM


All times are GMT -4. The time now is 08:42 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.