Stock muffler valve/flap

[greasyjoe]

Does the WRX come with a muffler that has a valve or flap of some kind that opens at high exhaust velocities - or am I thinking of a different car? If it does, I'm sure someone has removed or modified it - what were the results?

[02nighthawksi]

NEGATIVE

[Trainrex]

The C6 Corvette has it.

[tarbaj]

The C6 Corvette has it.

Nissan used it in the Skyline and the Maxima before GM copied it to the C6 Vette.

[cavallino333]

Ferrari's had it for a while. I think the 348 or the 355 was the first Ferrari to have it

[speedDman1]

vw R32 has it...all the R32 guys do the "exhaust flapper mod*, which is putting a zip-tie on the flapper, which makes it significantly louder.

[cheeseybacon]

The EVO IX has one as well.

[Electric-Mayhem]

No flapper on the Rex, but alot of the European companies have been using them lately. The new Aston Martin V8 Vantage has one, as well as the BMW M series cars made in the last year. Most of these seem to be used in a "sport" mode. Seems like it just opens up the exhuast flow a bit and gives it that nice high performance race car growl. The Vantage is definetly one loud ass car when you get on it, but it evidently quiets down alot when you just drive nice and aren't at WOT all the time. Kinda cool. I've seen people add these to the wrx, but its really loud when open and most only use it for the race track. When I changed out my Catback (got the the catless DP and UP first), I just couldn't resist turning the car on to see how really loud it would be without a muffler, and to say the least it was no disapointment. A little loud for every day use for me, though some people do go with just a straight pipe.

JH

[speedDman1]

how would one add one of these flapperes to their exhaust on a wrx? I want to get a loud exhaust...but not have it be loud when I'm on the highway and such...so I'm interested.

[cavallino333]

I've seen people add these to the wrx, but its really loud when open and most only use it for the race track. When I changed out my Catback (got the the catless DP and UP first), I just couldn't resist turning the car on to see how really loud it would be without a muffler, and to say the least it was no disapointment. A little loud for every day use for me, though some people do go with just a straight pipe.

JH

I think your thinking of a cut-out thats a little different.

[Electric-Mayhem]

different method...same idea. Yes, its the cutout. Pretty much its a y-pipe with a solonoid. You attach one end of the Y to your normal exhaust route, and one is just open ended. The solonoid controlls a little gate thing that open and closes. Most people install it after the downpipe, so that it still gets the exhaust gas away from the important bits of the car and to insure that you don't get carbon monoxide and other fun stuff in the cabin of the car. Not sure how much it costs, but you can just buy it and have it welded in place at a muffler shop. You'll have to run some wires for control and power, and install a switch inside the car to control it. Its about the closest thing to what the car manufacturers have been using lately. I think those are built seamlessly into the exhaust system and still go through the muffler. I imagine it works in a similar way, except the cars ECU controls the solonoid rather then you pushing a switch. If you are interested in pics or a write up, just search for exhaust cutout or something like that on here or nasioc.

JH

[hellbilly1342]

QUICKTIMEPERFORMANCE.COM has the cut out downpipe for the rex. i got one used off a buddy. it's quite fun sitting at a stoplight flipping the switch to open and close it next to cars. they look at me kind of confused.