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carlc376 09-25-2017 06:42 AM

Aura XR 3.6 Front Cat Flex pipe
My Aura XR with the 3.6 has developed a loud exhaust. I got under the car and can see where there is an area of the Flex pipe that is wet. I started the car and confirmed that this is the exhaust leak I am hearing as I can feel exhaust in this area. I have seen that this is part of the the front Cat tube and does not seem to be sold separately (except universal). The car has around 133,000 miles. I have considered just replacing the whole cat/pipe combo (found online at $250, installed myself), but this seems an overly expensive fix considering the cat is still working properly.

Has anyone replaced just this flex pipe and know the dimensions (or what the replacement was? (I searched for it on this site, but only found an entry for an Astra 4cyl).

On an online parts site, I did find EASTERN CATALYTIC 80071, which kinda looks like the part, but it states it is Pre-Cat, and the one in question is clearly after the cat, but before the connection to the rear cat assembly.

Thank you for any input on this.

fdryer 09-25-2017 08:51 AM

Re: Aura XR 3.6 Front Cat Flex pipe
There are several ways to handle this repair. One would be a straight replacement altogether as you're buying most likely stainless to reflect the costs for less corrosion over a longer lifetime. The flex pipe is stainless for the braided portion. The inner flex tube may or may not be stainless - flexing stress hardens metals until they crack. Yours has the flex pipe at the end(?) with a flange coupler. If that's correct (looked at rockauto parts), you'd have to consider removing the section for cutting and welding a flex pipe and flange. This may be more trouble than its worth unless you weld it yourself or bring parts to an exhaust shop willing to weld parts.

While many presume stainless as shiny, factory exhaust systems leave an unfinished surface that grows surface rust but not rust thru. GM and maybe others decided to use stainless (409) for better corrosion resistance from higher water vapor generated from emissions from EFI systems.

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