Flex Pipe on the Downpipe
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Joined: 06-22-08
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From: SO CAL
Flex Pipe on the Downpipe
OK so i am working with a company thats aking a new DP thats coming out. 3 in catless as it should be.
But they decided to not put a flex pipe in there. Just straight flange then pipe.
Iasked why they did this and they said flex pipe makes you lose HP. but now im curious because I dont want to crack welds or Bolts because I know the motor moves.
Discuss?
But they decided to not put a flex pipe in there. Just straight flange then pipe.
Iasked why they did this and they said flex pipe makes you lose HP. but now im curious because I dont want to crack welds or Bolts because I know the motor moves.
Discuss?
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Joined: 03-05-09
Posts: 1,028
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From: Des Moines, IA
If you've ever fabricated many exhaust parts, you know why the flex is there. Keeps everything from rattling & reduces the possibility of cracking and metal fatigue in general. Even with solid mounts a motor rocks back/forth quite a bit during hard pulls. For a street duty car I'd be hard pressed not to use one.
A GOOD QUALITY flex isn't cheap, so there are financial reasons why a shop might not opt to use one. The performance angle of it would be really minimal if hardly measurable.
A GOOD QUALITY flex isn't cheap, so there are financial reasons why a shop might not opt to use one. The performance angle of it would be really minimal if hardly measurable.
If you've ever fabricated many exhaust parts, you know why the flex is there. Keeps everything from rattling & reduces the possibility of cracking and metal fatigue in general. Even with solid mounts a motor rocks back/forth quite a bit during hard pulls. For a street duty car I'd be hard pressed not to use one.
A GOOD QUALITY flex isn't cheap, so there are financial reasons why a shop might not opt to use one. The performance angle of it would be really minimal if hardly measurable.
A GOOD QUALITY flex isn't cheap, so there are financial reasons why a shop might not opt to use one. The performance angle of it would be really minimal if hardly measurable.
You should really have a flex as stated here, they are not cheap, but well worth it. It should be a good flex also, otherwise the flex itself will fail.
Mounts will help, but will not be enough to remove/forget about having a flex.
A company should not cheap out to have a better apealing price and not put a flex in, they (the company) will most likely have many product failures.
Last edited by TurboTechRacing; Nov 23, 2009 at 01:41 PM. Reason: Automerged Doublepost
i find it hard to believe a reputable large company would need to have any advice on whether or not to use a flex pipe.. i'm not saying i don't believe this is what they've told you, i'm saying what most other ppl here have said, it's not right. a good company would be more interested in doing things correct..
i find it hard to believe a reputable large company would need to have any advice on whether or not to use a flex pipe.. I'm not saying i don't believe this is what they've told you, i'm saying what most other ppl here have said, it's not right. A good company would be more interested in doing things correct..
Moving the flex piece I would be a fan of. I never liked how the Flex was RIGHT at the turbo. Altho it seems to work well, just something that rubbed me wrong from day 1 honestly.
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