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Reducing downpipe I.D

IrishDave Oct 3, 2015

  1. IrishDave

    IrishDave Registered User

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    Thinking of reducing my down pipe from 3" to 2.5" where it passes the propshaft, using something like this http://www.ebay.com/itm/Vibrant-2-5...f8088cc&pid=100005&rk=2&rkt=2&sd=201418236259, then going back to 3", as it is constantly rubbing and is really starting to annoy the sh!7 out of me. I have had a few exhaust places try and fix it but to no avail.
    Question is will this hinder performance, how much of a restriction is it likely to cause?
     
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  3. superkarl

    superkarl MAN OF STEEL

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    Strategic dent
     
    Gops likes this.
  4. Prawn

    Prawn My other car is a MINI!!!!

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    Heat it. Bash it. Be happy.
     
  5. IrishDave

    IrishDave Registered User

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    Already tried the strategic dent and still rubs.
     
  6. Tom93

    Tom93 Registered User

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    Shift the engine on the mounts...
     
  7. IrishDave

    IrishDave Registered User

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    Tried that also. I have pretty much tried everything. My last option is to reduce the pipe size, so I just want to know how much this will affect performance.
     
  8. IrishDave

    IrishDave Registered User

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    The only time it has not rubbed is when the oe manifold was still on the engine.
     
  9. vivalacoulter

    vivalacoulter Registered User

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    Strange, lots of people have gotten away with that downpipe. I suggest you give it another bash, eventually you'll make enough space.
     
  10. superkarl

    superkarl MAN OF STEEL

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    I know how bad can it be rubbing to not work with a dent.
    What engine mounts do you have?
     
  11. aragorn

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    why do you think gaining 1/4" from going from 3" to 2.5" will make a difference if a 1/4" dent wont?

    Make the dent bigger if need be.

    Many OEM exhaust systems have huge flats pressed into them to create clearance for things.
     

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