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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Who needs a secondary cat delete...



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      06-24-2013, 11:35 AM   #1
tcw
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Who needs a secondary cat delete...

When you can do this!




Looks like the two-step and single turbo were not a good match for the mid-cats. This is just one, the other one had a smaller hole and some cracks as well. I replaced them with some Vibrant 1790 resonators (stock exhaust). Although, it looks like I could have just finished destroying these.

FWIW I have not smelled gas around my car (other than a little on cold starts when backing out a closed garage) nor seen smoke in my rearview. And I don't expect this to change seeing after my cats were not doing much anyways.
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      06-24-2013, 11:56 AM   #2
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Your mufflers probably sounds like a rain sticks. Usually in a case like this you'll hear popping noises coming from the exhaust. The Little pieces popping like popcorn. I would say if you have a single you might want to invest in an aftermarket exhaust. To me that looks like a bad case of back pressure which adds a lot of heat.
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      06-24-2013, 12:07 PM   #3
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Haha, had to look that up. http://en.wikipedia.org/wiki/Rainstick

I think any pieces of the cat should have went out the tailpipe.

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