SpawnGT Posted December 17, 2008 Share Posted December 17, 2008 Ok, so i know ive created at least 2 threads regarding this matter before (at least 6 months ago) but each time they get piled on with threads that have been bumped up. So here is my question again, is there an exhaust out there that has dual personalities. Meaning at low RPM (or even low boost) the exhaust is very very quiet almost stock, but when you give it a lot of gas and/or raise the RPM high enough (or even high enough boost) the exhaust gas pressure opens some kind of valve and makes the exhaust louder? This is similar to what Mercedes, BMW, and Audi/VW have been doing for along time. What they have in their mufflers is a valve that is controlled by some means or form. When you are driving around the valve is pretty much closed and the exhaust noise is being HIGHLY baffled by the muffler, but when you really get on it the valve is opened up and the sound and gas is allowed to leave through the UN-baffled part of the muffler (usually through a different tail pipe, in the case of VW R32's at least) In case someone is confused completely as to what i'm talking about this is an example of the VW R32 exhaust. [ame=http://www.youtube.com/watch?v=BQUE271zAbw]YouTube - VW R32 exhaust flapper mod[/ame] Link to comment Share on other sites More sharing options...
cfdrumr Posted December 17, 2008 Share Posted December 17, 2008 hmmm...Some sort of rotating flapper on a springed mechanism. Sorta a cutout. Maybe an electronic cutout that is connected to throttle pressure? Link to comment Share on other sites More sharing options...
SpawnGT Posted December 17, 2008 Author Share Posted December 17, 2008 hmmm...Some sort of rotating flapper on a springed mechanism. Sorta a cutout. Maybe an electronic cutout that is connected to throttle pressure? Well i've had an electronic cutout, in fact i've had two different ones on my car, the time necessary for it to open is far greater then the time that you would be on the throttle. Ive also had straight pipes, and the XO2 system on my car, right now im runnning XO2 with stock mufflers though. Link to comment Share on other sites More sharing options...
Long Island Legacy Posted January 21, 2009 Share Posted January 21, 2009 I don't think any aftermarket manufacturing companies that make a sophisticated muffler to have that sort of feature. I know bmw has some sort a vacume line to the flapper it similar to a wastegate accuator by the looks of it. Link to comment Share on other sites More sharing options...
rao Posted January 21, 2009 Share Posted January 21, 2009 You can add an electronic exhaust cut out to any exhaust system. http://www.quicktimeperformance.com/QTEC/index.php They are illegal in most states so be careful although they are available from the factory on Corvettes, so they must not be any good Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
nekdut Posted January 21, 2009 Share Posted January 21, 2009 Apex-i revo PS has this exact feature, and they make an LGT fitment. Link to comment Share on other sites More sharing options...
camber Posted January 21, 2009 Share Posted January 21, 2009 Nissan, used mufflers like that in the 5th generation Maxima and previous generation GT-R. Looks like Apex-i revo PS has incoporated this idea, into an LGT fitment. Link to comment Share on other sites More sharing options...
EquinnoxX Posted January 24, 2009 Share Posted January 24, 2009 Spawn man just get a quieter exhaust. Fujitsubo FTW Link to comment Share on other sites More sharing options...
wengermi Posted January 25, 2009 Share Posted January 25, 2009 http://www.legacygt.com/forums/showthread.php?p=2235488 Link to comment Share on other sites More sharing options...
apexjapan Posted January 26, 2009 Share Posted January 26, 2009 Heh, it used to be a stock feature on my 99 JDM Twin-turbo Legacy. Had a electronically controlled flapper that opened up a second pipe into the muffler. It wouldn't open till about 3000-3500rpm, I believe. It's been a while. Nearly 100% of Japanese twin-turbo Legacy owners did the same thing I did - just wired it open permanently. It performed better that way, and even Subaru got the idea eventually, dropping that feature from the cars in the future. Cheers, Paul Hansen http://www.avoturboworld.com Link to comment Share on other sites More sharing options...
PeterJMC Posted January 26, 2009 Share Posted January 26, 2009 I had dual mode mufflers on my Cobra. The system is Badass . Nice throaty rumble at idle and a screaming banshe at WOT http://forums.stangnet.com/737299-fr500-catback-ct.html I think I'll spend my afternoon researching dual mode mufflers for the Legacy. Link to comment Share on other sites More sharing options...
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