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The One That Didn't Get Away [100K Mile E30 325is]


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9 hours ago, P_Roloff said:

I believe the donut gaskets can both be replaced, however I have only ever done the one that sits loose between the flanges on the cat and cat back section. 

I’d like to preface this by saying I have an aftermarket muffler so it might not be the same, but on mine, one donut is pressed onto one of the pipes on the cat side, with an inch or two of pipe extending beyond it, and the other cat side pipe ends in just a flared flange. On the cat back side, both pipe ends are flared. Thus, when you put them together, the small protruding pipe section on the cat side serves to line everything up, and once it’s nearly in place you slip the other donut in between the two flared flanges on the second side and then bolt everything together to hold it all in place. 

So yes, you should in theory be able to replace them both. The donut that is pressed on will probably have to be cut off, however, if your exhaust is anything like mine was. 

I also just took a closer look at your pictures, and it appears one of your bolt flanges is broken in half on the cat side, so that’ll be your bigger issue here. That’ll require fab work of some sort because those wont come off/go back on due to the flared pipe ends. 

Yes, the flared bolted flange is the issue. I was incorrectly using the donut gasket and the flange terms backwards for what I was trying to describe. But yes, I'm starting to look around for local shops that could cut the flared end off after the cat and weld a flared piece back on, or just weld the flange on.

I am using the Ireland Engineering catback exhaust which is pretty much a factory replacement with just a slightly different muffler(only in sound, dimensions appear the same).

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Well, the biggest issue with the car(incredibly), has been resolved. I have never had a working stereo system in this car since I bought it. I’ve used a Bluetooth speaker on my dashboard, and that shit was getting old.


I went with the tried and true Continental head unit. This was my first time doing any kind of stereo work(other than the speakers in my truck). The install was pretty straight forward, but was a little confusing at first because there weren’t some of the wires that were mentioned in the install. Realized I had to peel the loom back a little to exposed them.

Was great to hear actual music come from the speakers instead of the R2D2 noises. Heard a little bit of thump coming from the rear deck speaker. Pulled it out, realized that the little rubber seal that sits on the metal frame of the speaker had come undone in one portion. Used some flexible super glue to get it set in place.


Sounds great for what it is, and really glad to no longer use a Bluetooth speaker.


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