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Old 11-02-2017, 06:30 PM   #1
smartrj
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Default Cobb Muffler Bypass

I was thinking about getting a 2.75inch section of pipe and sliding it into my 04 wrx Cobb (catback) "muffler" section to get it a bit louder while looking mostly stock. I'll be able to take it off whenever I want and could attach a bolt on the inside of the pipe to keep it from coming loose. Any ideas? Would this work with a cobb muffler or no? If anyone has attempted this before or has advice I would really appreciate it.
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Old 11-03-2017, 09:45 AM   #2
rtv900
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That sounds pretty hokey man.
In the muffler? It's hard to even tell what you are describing.

If you want the ability to go super loud and back again you need a legit cutout. If you want it cheap you can get a manual one where you either have to unbolt a block off plate or manually open a valve, in which case it will cost almost nothing, just work.
If you can spend $400 give or take a little you can get an electric cut out and open it with a switch from inside.
I had them on my hot rod at one time. They are fun as hell no doubt.
But they need to be installed ahead of the mufflers in the pipe, not just stuck in a hole in the muffler.
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Old 11-03-2017, 10:01 AM   #3
isotopesope
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sounds like a great way to develop a "mystery" exhaust rattle.
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Old 11-03-2017, 11:55 AM   #4
rtv900
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Quote:
Originally Posted by isotopesope View Post
sounds like a great way to develop a "mystery" exhaust rattle.
ha ha, I was thinking the exact same thing too
That's like a recipe for a phantom rattle that makes you nuts
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Old 11-09-2017, 04:15 PM   #5
wantsti
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I did the same thing. I took my car to a muffler shop and he got some pipe and expanded the ends little by little till is was a snug fit but could still slide in and out. Then i welded a nut on the end and used a bolt to to lock it in place. It never rattled and made a huge difference in sound.
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Old 11-13-2017, 07:39 PM   #6
smartrj
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Quote:
Originally Posted by wantsti View Post
I did the same thing. I took my car to a muffler shop and he got some pipe and expanded the ends little by little till is was a snug fit but could still slide in and out. Then i welded a nut on the end and used a bolt to to lock it in place. It never rattled and made a huge difference in sound.


Okay yea this is exactly what I was thinking. Iím gonna give it a try. Thanks
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Old 11-14-2017, 10:15 AM   #7
JazzyJake
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Just buy a kit to do it man. You could install it right before the muffler, and have the dump with a small downturn so the exhaust goes down instead out out the back.
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Old 11-25-2017, 03:41 AM   #8
smartrj
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Update: did what wantsti did and it sounds great--sounds similar to a muffler delete. It's a nice temporary sound before getting a real downpipe. Doesn't look that great though but I'm willing to sacrifice that.
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