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No boost on secondary


TerryM

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If you shake the suspect Muffler is there anything rattling around inside it?

I think the OEM Mid Pipe has a Cat. You could knock the guts out of it with a long rod?

Edit: Sounds like the Guts from your Cat is already living inside your Rear Muffler though.

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If I shake the mid pipe or slam a door shut it sounds like a bolt rocking back and forward somewhere in there. In the next day or so I\'ll take the midsection out and smash the guts of the cat out with a rod. Any other suggestions? Is it normal for a cat to block up?

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For Boost/Psi changes that dramatic from a different Rear Muffler, it\'s definitely blocked up. %100.

Cats do block up, they gunk up with Carbon build up and burnt oil etc. Newer cars have Front and Rear O2 Sensors that monitor the Cats efficiency, tripping a CEL when the CAT stops functioning. Some cars have Cat Temp Sensors, because they heat up when they fail. I think older Cats were made of stuff like Horse Hair, it breaks down with age and lodges itself in the Rear Muffler. Which is what you must have going on.

If nothing will shake out of the Muffler, you could try hooking/fishing stuff out with a bent piece of Wire?

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