Welcome to the North American Subaru Impreza Owners Club Thursday September 18, 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 General > General Community

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 08-02-2014, 12:36 PM   #1
joshnosh
Scooby Newbie
 
Member#: 384420
Join Date: Mar 2014
Chapter/Region: International
Location: bedfordshire, UK
Vehicle:
2004 WRX
blue

Default exhaust flap mod idea?

hi all
just wondering if anyone has ever put a flap in there exhaust?

iv currently got stock headers with a decat uppipe and decat 3inch bell mouth down pipe
pro drive back box and stock 2.5 inch resonator

the car sounds alright but id like to hear it a bit more when im gunning it. problem is on tick over the car is already pretty drony and annoying.

iv noticed that when i put my foot in the exhaust outlet though it gets much much quiter

my idea is to replace the center section with the resonator in it with a strait pipe with a flap in it. that way i can close the flap and have a "silent" mode.
like this


seems to be factory installed in some VAG cars

ideas?
* Registered users of the site do not see these ads.
joshnosh is offline   Reply With Quote
Old 08-02-2014, 12:53 PM   #2
RockNRace03
Scooby Newbie
 
Member#: 322678
Join Date: Jun 2012
Default

i dealt with these a lot when i built high performance exhaust for exotic sports cars. It very well can be done by almost any exhaust shop. But I would suggest purchasing as high quality valve as you can (like this.http://www.summitracing.com/parts/qt...MuIaArfa8P8HAQ ) The junky ones leak constantly and makes your car sound like poop at idle. I would also check with a tuner to make sure you will not need some adjustments to keep the car from over boosting. But i would imagine it could be done fairly easy by a performance car shop, or even a local muffler shop that does quality work. They also make valves that work with the vacuum system of the car so that as engine speed increases, so does the cut-out opening. Most of the Ferraris/ Porsches/ Lamborghinis that had them from the factory were placed just in front of the muffler, and then re-routed them into the tips.
RockNRace03 is offline   Reply With Quote
Old 08-02-2014, 01:09 PM   #3
joshnosh
Scooby Newbie
 
Member#: 384420
Join Date: Mar 2014
Chapter/Region: International
Location: bedfordshire, UK
Vehicle:
2004 WRX
blue

Default

why would it overboost with more backpressure? and ill probably drill a hole in it so it leaks a bit anyway.
joshnosh is offline   Reply With Quote
Old 08-02-2014, 01:18 PM   #4
HinshawWRX
Medium Frank
Moderator
 
Member#: 140114
Join Date: Feb 2007
Chapter/Region: MAIC
Location: Common Sense, VA
Vehicle:
2014 Porsche
GT3 (Currently on Fire)

Default

http://forums.nasioc.com/forums/show...94357&page=111

http://forums.nasioc.com/forums/show...postcount=4438

That person used that exact one, but in a slightly different manner. However what you are looking at is an exhaust cut out. Yes, many people have done it.
HinshawWRX is offline   Reply With Quote
Old 08-02-2014, 01:46 PM   #5
joshnosh
Scooby Newbie
 
Member#: 384420
Join Date: Mar 2014
Chapter/Region: International
Location: bedfordshire, UK
Vehicle:
2004 WRX
blue

Default

Quote:
Originally Posted by HinshawWRX View Post
http://forums.nasioc.com/forums/show...94357&page=111

http://forums.nasioc.com/forums/show...postcount=4438

That person used that exact one, but in a slightly different manner. However what you are looking at is an exhaust cut out. Yes, many people have done it.
looks like it will work then. i may well drill a hole in the flap or if im feeling really flush then add a servo and a micro controller to automatically close the flap at idle and open it up a little more and more as the revs pick up


cheers!
joshnosh is offline   Reply With Quote
Old 08-02-2014, 03:44 PM   #6
HinshawWRX
Medium Frank
Moderator
 
Member#: 140114
Join Date: Feb 2007
Chapter/Region: MAIC
Location: Common Sense, VA
Vehicle:
2014 Porsche
GT3 (Currently on Fire)

Default

Quote:
Originally Posted by joshnosh View Post
looks like it will work then. i may well drill a hole in the flap or if im feeling really flush then add a servo and a micro controller to automatically close the flap at idle and open it up a little more and more as the revs pick up


cheers!
Or you can spend the money to buy an electric cut out instead of retrofit a manual one.
HinshawWRX is offline   Reply With Quote
Old 08-02-2014, 07:08 PM   #7
joshnosh
Scooby Newbie
 
Member#: 384420
Join Date: Mar 2014
Chapter/Region: International
Location: bedfordshire, UK
Vehicle:
2004 WRX
blue

Default

Quote:
Originally Posted by HinshawWRX View Post
Or you can spend the money to buy an electric cut out instead of retrofit a manual one.
they look expensive though? and they dont come with controllers?

a servo only cost around 20 quid. there rest i can do for very little cost
joshnosh is offline   Reply With Quote
Old 08-03-2014, 06:36 AM   #8
SpamBot
Scooby Specialist
 
Member#: 287534
Join Date: Jul 2011
Default

If you want to do this on the cheap, you could find an old shoe, drill a hole across the heel, and hinge it somehow to your exhaust outlet. Tie a string to the toe and run it inside the car. When you wanted to quiet the exhaust, pull on the string, and it would be just like putting your foot in the exhaust!

I'm happy to see that the kidiot phenomenon is international with these cars.
SpamBot is offline   Reply With Quote
Old 08-03-2014, 09:49 AM   #9
HinshawWRX
Medium Frank
Moderator
 
Member#: 140114
Join Date: Feb 2007
Chapter/Region: MAIC
Location: Common Sense, VA
Vehicle:
2014 Porsche
GT3 (Currently on Fire)

Default

Quote:
Originally Posted by joshnosh View Post
they look expensive though? and they dont come with controllers?

a servo only cost around 20 quid. there rest i can do for very little cost
I prefer to do things correctly.
HinshawWRX is offline   Reply With Quote
Old 08-03-2014, 12:13 PM   #10
Goatcrapp
Scooby Newbie
 
Member#: 64289
Join Date: Jun 2004
Chapter/Region: Tri-State
Location: Brooklyn, NY
Vehicle:
2004 wrx wagon
wrb

Default

Just remember, kiddos - "One downside is when it is fully closed the engine doesn't like it."

lol
Goatcrapp is offline   Reply With Quote
Old 08-03-2014, 06:15 PM   #11
Chuckls
Scooby Specialist
 
Member#: 280696
Join Date: Apr 2011
Chapter/Region: MWSOC
Location: Kentuckiana
Vehicle:
2005 WRX
OBP

Default

This is where I have my cutout. Works WONDEFULLY.

Chuckls 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


All times are GMT -4. The time now is 10:41 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.