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Thread: Modified OEM Downpipe

  1. #1
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    Modified OEM Downpipe

    i thought i had posted up about this but had a quick search and it would seem like i haven't

    Anyway i had been looking for a second Downpipe to modify (take the pre Cat out) but as luck would have it a few weeks ago whilst i was at work a friend of mine spotted this on another forum and aquired it for me already gutted which was a bonus.

    Pic of gutted Downpipe



    Once i had picked it up i got in contact with another friend of mine to see if he could run a bead of weld around the inside to try and smooth it out to aid flow.

    Downpipe after Welding



    And thats how it sat for a few weeks until i found the time to fit it, finally managed to get it sorted yesterday an absolute PITA job to do on your drive by the way, come MOT time im either going to rent a ramp or pay someone to fit it lol.

    Quick pic to show OEM Vs Modified OEM



    Modified



    Now thats on the car i have a RR'd session booked for Thursday morning to run the car in its current guise, once finished there i will be heading off to get the APR Stage 2 software loaded onto the car then hopefully back to the RR to see if there are any significant gains to be had.

    Car Spec as it stands

    APR Stage 1 V2 software
    Forge Front Mount IC
    De-Catted OEM downpipe
    Secondary Cat delete pipes
    Milltek Cat back non Res

    Waiting on a Pipercross filter hopefully here Wednesday

    Will keep you guys informed with Pics,Vids and graphs all being well

    Cheers

    Chris
    Last edited by Chris-32T; 2nd September 2013 at 17:46.
    Kelza and quattro81 like this.

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  3. #2
    nervus's Avatar
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    Nice, please post the results!

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    babyboss's Avatar
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    whats the power gains on d/pipe ?
    whats the running diff in forge cooler ?

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    Kelza's Avatar
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    Hi Chris how easy or hard is it to take the cats out ?cheers

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    Dave Hedgehog's Avatar
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    Will this be easy to spot by the MOT tester? or will you have to temp refit them for the test?

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    To answer your questions, firstly getting the downpipe off is a bit of a chore but doable, I did it on the drive however a ramp would be much easier. With regards to removing the cat I wouldn't know I bought my downpipe already gutted so I could keep the OEM one intact come sale/trading in time.

    But looking at the inside of my OEM pipe, once it's of just use a hammer and chisel to remove the insides. With regards to MOT time because there is no physical evidence or tell tale sign there isn't a cat in there then how would the tester know ??

    Would possibly fail on Emissions but then there are ways around that aswell

    Best bet is to try and find one already gutted or a cheap second hand downpipe and gut that, once fitted the car pulls stronger and breathes a whole lot easier.

    I would expect to gain between 5-10 bhp possibly more and from what I've seen/read the gains are equivalent to those seen with the milltek etc downpipes.

    Cheers

    Chris

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    Thanks Chris ,it just seems a cheaper option than a uprated downpipe (1k) just trying to work out what's best at the moment ,cheers

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    Well I paid £300 for my gutted downpipe, and fitted it myself so much much cheaper, but even if you paid someone to fit it the chances are it still would be less than half of just the cost for a milly version with the latter yielding no extra benefits. So it's a no brainer IMO.

  10. #9
    45bvtc's Avatar
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    Quote Originally Posted by Dave Hedgehog View Post
    Will this be easy to spot by the MOT tester? or will you have to temp refit them for the test?
    ONLY when sniffing the exhaust, I'd guess.

    Run a 'fully-cated' RS3 end-to-end with Bluey's sans secondary cat(s) system and you can certainly smell 'a' difference that ain't just down to body colour...
    DAYTONA500 likes this.

  11. #10
    Dave Hedgehog's Avatar
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    Quote Originally Posted by 45bvtc View Post
    ONLY when sniffing the exhaust, I'd guess.

    Run a 'fully-cated' RS3 end-to-end with Bluey's sans secondary cat(s) system and you can certainly smell 'a' difference that ain't just down to body colour...
    I guess it depends on how much effort they are going to apply to check the cats after the change to the MOT test

 

 

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