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Modify stock exhaust to remove flapper

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Old Oct 22, 2009, 04:21 PM
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Modify stock exhaust to remove flapper
I would have sworn I'd seen a writeup on this, but cannot find it anywhere. Can anyone point me in the right direction? Anyone aware of a dyno comparison between stock and the flapper removed?

TIA
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Old Oct 22, 2009, 04:38 PM
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It's not the flapper you remove (you can to reduce the vibrations afterward) but the pipe that connects the two side chambers of the muffler.









Also, I did a dyno comparison in DLL.



Darker lines are the "after."
Last edited by atombomb33; Nov 2, 2009 at 08:16 AM.
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Old Oct 22, 2009, 05:39 PM
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How did you know where to cut? Looks like you nailed the locations perfectly.
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Old Oct 22, 2009, 07:02 PM
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nice gains considering what was done.
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Old Oct 22, 2009, 08:17 PM
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Rock on dude! That's exactly what I was looking for.
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Old Oct 22, 2009, 08:49 PM
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what does it actually do?
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Old Oct 22, 2009, 10:37 PM
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How much louder did it make the exhaust?
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Old Oct 22, 2009, 11:04 PM
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Originally Posted by 4G63punk
what does it actually do?
Take a look here at the guts of the Evo X muffler: http://www.worksevo.com/store/produc...roducts_id=502

By removing that pipe, you bypass that convoluted internal routing and allow the exhaust to flow into the muffler and directly out the tailpipes.

Originally Posted by Grip Master
How much louder did it make the exhaust?
You can definitely tell the muffler is free flowing after the mod. Has a nice growl, but hardly louder than stock.

http://s159.photobucket.com/albums/t...t=100_3040.flv

That's a crappy vid clip with lots of BG noise, but you get the idea. Nice and subtle still.
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Old Oct 30, 2009, 08:58 AM
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Anyone know what the stock muffler is made out of? Stainless? Galvinized steel? Thanks
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Old Nov 2, 2009, 07:09 AM
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Originally Posted by Grip Master
Anyone know what the stock muffler is made out of? Stainless? Galvinized steel? Thanks
Now a days I think all cars have stainless, they last a lot longer!
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Old Nov 2, 2009, 08:17 AM
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seems a lot of work to do by yourself.. prob would recommend a shop to do this lol
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Old Nov 2, 2009, 08:22 AM
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Originally Posted by Grip Master
Anyone know what the stock muffler is made out of? Stainless? Galvinized steel? Thanks
It's definitely stainless, but probably crappy T409 (since it was rusting already). I didn't have any stainless wire, so I just welded it back up with mild.

Originally Posted by blueberryyumyum
seems a lot of work to do by yourself.. prob would recommend a shop to do this lol
Not really... took me no more than 30 minutes to do the whole job. The muffler part itself takes 15-20 min at most. All you need is a sawzall and a welder. Easy peasy

But then again I tackled a clutch install on the X in the same exact spot in my driveway... I'm just dedicated and cheap.
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Old Nov 2, 2009, 08:55 AM
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noob question here, no CELs?
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Old Nov 2, 2009, 08:57 AM
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Shouldn't cause any CEL. You're pretty much home free after the back O2 sensor.
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Old Nov 2, 2009, 08:58 AM
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Mendo, just noticed you're in Dallas - Denver at Evo Dynamics is doing mine.
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