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I thought it was for allowing bending in the exhaust under engine load.

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Old 07-08-2009, 03:49 PM   #1 (permalink)
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I thought it was for allowing bending in the exhaust under engine load.
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Old 07-08-2009, 04:10 PM   #2 (permalink)
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I thought it was for allowing bending in the exhaust under engine load.

It is to an extent.

Cars that have very weak motor mounts have an excessive amount of engine travel when it moves. Ex: a place where they would be needed would be on a car with sloppy motor mounts and very stiff rubber hangers. This will allow the front part of the exhaust to travel easier with the engine when it torques.

Now, this particular car has strong motor mounts and the engine travels very little when it torques. That in combination with the rubber hangers underneath that are not on the stiff side allow the exhaust to travel with the engine. If it was an issue for us believe me, I would put flex joints in. But, you don't see our X Pipes cracking or welds at flanges breaking. Reason being, the exhaust has plenty of travel on these cars to allow it move.
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Old 07-08-2009, 04:31 PM   #3 (permalink)
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I thought it was for allowing bending in the exhaust under engine load.
Nah, if that was true, you'd have a broken engine mount. It's a fitment / something to go wrong later, device.
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Old 07-08-2009, 04:54 PM   #4 (permalink)
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Nah, if that was true, you'd have a broken engine mount. It's a fitment / something to go wrong later, device.

Correct, I see more customers with random exhaust systems that come in with blown out flex joints than just about anything. Most of the time they catch them on the pavement a wear all the way through the mesh.
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