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Old 11-29-2014, 12:00 PM   #1
v8volvoman1
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Default 3" flexpipe for downpipe

I was wondering what folks have been running for a weld-in flex pipe on their turbo Volvo. I bought a cheap 2.5" diameter flex pipe about three months ago and it has already blown out. Tell me what has worked for you (diameter, brand, mileage since exhaust was built, etc.), how long you've been running with it and what hasn't worked for you.

I need something more robust that's a weld-in application. I have a 3" downpipe reducing into a 2.5" and would like to extend the 3" a little further.
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Old 11-29-2014, 12:06 PM   #2
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in my experience they are not needed on our cars.
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Old 11-29-2014, 12:55 PM   #3
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using a cheap-ish (35 euro) 3" flexpipe right behind the catalytic converter. Has been in use for 5 years now without issues. Only a bit rusty now. The damage is from some scrape on traffic bumps.
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Old 11-29-2014, 01:08 PM   #4
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I bought this about five years ago and it's still there......I didn't use clamps, welded it on.


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Old 11-29-2014, 08:00 PM   #5
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Try mandrel bend solutions. You want a flex coupler with a rigid interlocking liner. The cheap braided inner / outer develop a significant restriction over time as the inner braiding will swell inwards. Anyone who believes otherwise is fooling themselves.



Just used one of their 3" on my DP - I cut the external later of woven braiding off due to interference fit with my firewall
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Old 11-30-2014, 02:37 AM   #6
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I've used the ones from atpturbo on multiple builds for years with out issue.
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Old 11-30-2014, 09:05 AM   #7
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Excellent feedback guys. Thanks!
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Old 11-30-2014, 01:24 PM   #8
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The flex pipes I use for builds are lined...they look like the cheap ones, but won't blow out. Make sure to check - they look the same.

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Old 11-30-2014, 01:49 PM   #9
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Why would a flex pipe be needed on a RWD car? I can understand why one would be needed on a FWD car.
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Old 11-30-2014, 02:09 PM   #10
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Originally Posted by lummert View Post
Why would a flex pipe be needed on a RWD car? I can understand why one would be needed on a FWD car.
As you can see in the pic above the down pipe is secured to the engine, that leaves the rest of the exhaust going out the rear of the car (lots of weight) only supported with a few rubber hangers that are going to bounce around a little.

They may not be needed but it's cheap insurance to avoid cracking a manifold.
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Old 12-03-2014, 03:23 AM   #11
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Having sold the big boy versions of these for marine and industrial diesels for about ten years, I've learned a few things.

First, you want to make sure it's an actual bellows, not just metal flex hose; bellows will take axial as well as lateral movement. Second, it's just meant to take up vibration and movement, not misalignment. And it can only move so far. Third, torsional stress will kill these quick - and it will split lengthwise like a zipper. If in doubt, two bellows at 90 degrees to each other will have near universal movement.

Oh, and that braid on the outside? When properly engineered, it helps damp out vibrations. Totally unnecessary for holding exhaust pressure.
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