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Thread: Scorpion Cat Bypass pipes finally fitted

  1. #1
    Mr_Freeze's Avatar
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    Scorpion Cat Bypass pipes finally fitted

    Lightning got her first upgrade!





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  3. #2
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    ​Tidy job. x
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    Did you have to remap having removed cats? And what kind of power gain does this give?

    Regards Bob

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    Procedure: secondary cat by-pass pipe fitting

    Proper job Neil, I'll post this now for others...

    1) Using a 13mm ring spanner carefully remove the 6-nuts holding the cat-pipes to the down pipes

    Make sure to spray the studs with WD40 or similar lubricant as the studs are mild steel and secured to the cat-pipes

    2) Using a 13mm ring spanner release the 4-nuts from the connecting-sleeves securing the cat-pipes to the primary silencer

    3) Carefully slide each connecting-sleeve forward and onto its respective cat-pipe

    4) Carefully remove both cat-pipes with the gaskets and the connecting sleeves

    5) Carefully remove the metal gaskets from the cat-pipes: use a thin broad blade or similar so as not to damage the gaskets

    6) You'll have noticed that the nuts on the connecting-sleeves were uppermost when you removed them; this is not good engineering practice as if the nut were to unscrew then the likelihood is that you'd loose both the nut and the screw so, when refitting, change the connecting-sleeves over so that the nuts are on the underside (hope this makes sense…)

    7) Slide the original nearside connecting-sleeve onto the offside bypass pipe (securing nuts down)

    8) Using the original metal gasket without sealant, assemble the offside bypass pipe to the offside down pipe: use stainless steel nuts and bolts where possible and make sure to coat the threads of ALL bolts with Copperslip or similar anti-seize grease

    9) Slide the connecting-sleeve on to the offside primary silencer pipe and pinch tighten both nuts and bolts (make sure you've applied Copperslip to the threads)

    10) Keep checking the alignment and tighten all 5-nuts and bolts to complete

    11) Use exactly the same procedure (7 to 10) and assemble the nearside bypass pipe

    12) Double check alignments and tightness of the fastenings

    The tools:

    [IMG][/IMG]
    Last edited by 45bvtc; 1st June 2013 at 11:15.

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    Quote Originally Posted by bobededog View Post
    Did you have to remap having removed cats? And what kind of power gain does this give?

    Regards Bob
    No remap needed as the sensors are before the cat's.

    I will report back how she feels after a few days driving.

    The power gains are not expected to be much maybe realistically a couple at most, silly figures of 10-15bhp would be silly.

    Others report the car rev's more freely and of course it will growl just a little deeper when pushed.

    Going out to play
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  7. #6
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    Great job that john and mr_freeze

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    Quote Originally Posted by 45bvtc View Post
    Proper job Neil, I'll post this now for others...

    1) Using a 13mm ring spanner carefully remove the 6-nuts holding the cat-pipes to the down pipes

    Make sure to spray the studs with WD40 or similar lubricant as the studs are mild steel and secured to the cat-pipes

    2) Using a 13mm ring spanner release the 4-nuts from the connecting-sleeves securing the cat-pipes to the primary silencer

    3) Carefully slide each connecting-sleeve forward and onto its respective cat-pipe

    4) Carefully remove both cat-pipes with the gaskets and the connecting sleeves

    5) Carefully remove the metal gaskets from the cat-pipes: use a thin broad blade or similar so as not to damage the gaskets

    6) You'll have noticed that the nuts on the connecting-sleeves were uppermost when you removed them; this is not good engineering practice as if the nut were to unscrew then the likelihood is that you'd loose both the nut and the screw so, when refitting, change the connecting-sleeves over so that the nuts are on the underside (hope this makes sense…)

    7) Slide the original nearside connecting-sleeve onto the offside bypass pipe (securing nuts down)

    8) Using the original metal gasket without sealant, assemble the offside bypass pipe to the offside down pipe: use stainless steel nuts and bolts where possible and make sure to coat the threads of ALL bolts with Copperslip or similar anti-seize grease

    9) Slide the connecting-sleeve on to the offside primary silencer pipe and pinch tighten both nuts and bolts (make sure you've applied Copperslip to the threads)

    10) Keep checking the alignment and tighten all 5-nuts and bolts to complete

    11) Use exactly the same procedure (7 to 10) and assemble the nearside bypass pipe

    12) Double check alignments and tightness of the fastenings

    The tools:

    [IMG][/IMG]

    The easier option is to go down to Cannock to see a certain John and let him do it, just make sure you have a couple of litres of Sangiovese fuel with you.

    BEWARE : avoid stepping on his toes while is doing the work , sorry I meant watch out for flying spanners...
    Last edited by Vito; 1st June 2013 at 20:54.
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  9. #8
    45bvtc's Avatar
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    Thank you Vito for your kind words...

    PS, my 1972 Lotus Europa did sell yesterday and will soon be off to a very good family and home just South of AUDI UK...

    Is it me?
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  10. #9
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    John did graciously offer to do the swap over for me, but due to the distance involved i found a local alternative.

    I feel that at some point in the future i will make the trip to casa del Bluey, if for nothing else but to check out his garage, but not this weekend,
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  11. #10
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    Well i had a nice little drive yesterday that involved a spirited section or 2.

    I don't know whether this is just a physcological response to the extra sound, but it definately feels like it rev's better, more crisper and slightly faster (Again it could be just in my head........Mark step in anytime and disect me).

    So round town, no real noticable difference, but open her up and a definate deeper growl and a more pronounced "BRRRUUPP" on the upshift when pressed hard.

    Verdict, not an expensive option but gives a pleasing result. VFM.
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  12. #11
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    Quote Originally Posted by Mr_Freeze View Post
    Well i had a nice little drive yesterday that involved a spirited section or 2.

    I don't know whether this is just a physcological response to the extra sound, but it definately feels like it rev's better, more crisper and slightly faster (Again it could be just in my head........Mark step in anytime and disect me).

    So round town, no real noticable difference, but open her up and a definate deeper growl and a more pronounced "BRRRUUPP" on the upshift when pressed hard.

    Verdict, not an expensive option but gives a pleasing result. VFM.
    Oh yes! Yes, yes, yes!

    Same on mine Neil, even Moschops said the same while driving mine (BLUEY)...

    Uncanny for a turbo/inter-cooled engine but it does seam to breath better/freer somehow.

    As for the noise, best not go there as I'm still utterly besotted by the noise both up and down the box…

    And thank you for your kind words too…
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    Yes I agree Neil, having driven Bluey the other week, it breathes more easily and sounds nice on the upshift..

    Do i or don't i.......Hmmmmmm
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    MBK
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    Quote Originally Posted by Mr_Freeze View Post
    Well i had a nice little drive yesterday that involved a spirited section or 2.

    I don't know whether this is just a physcological response to the extra sound, but it definately feels like it rev's better, more crisper and slightly faster (Again it could be just in my head........Mark step in anytime and disect me).

    So round town, no real noticable difference, but open her up and a definate deeper growl and a more pronounced "BRRRUUPP" on the upshift when pressed hard.

    Verdict, not an expensive option but gives a pleasing result. VFM.
    I'm completely positive about the secondary decat pipes. I think there are two different things to think about. One is effect (what the mod does) and the other id affect (how the mod changes how you think and drive).

    Effect - almost certainly some reduction in back pressure from the turbo and enough to feel a little more throttle response for sure. More performance, probably a small increase with learning ECUs and all that. There is more growl and deeper roar with decat pipes. We heard several pass from the side of the road at the meet and it's a noticable difference, well within the normal range of exhausts and at the same time good.

    Affect - I think the added sound has a big influence on how you drive and how you feel about the drive. You like the sound and so you want to experience it more often. That in turn gives you more reason to enjoy the car. The sound makes you feel like you are going faster (you may well be). As a result you enjoy the car more...

    All in all a great mod for a reasonable price.

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    Is that true:

    http://www.scorpion-exhausts.com/sit...rs3%20dyno.jpg

    How much is the full line?

  16. #15
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    Full milltek is 2k plus so id say the scorpion is around that price ,could be cheaper ..

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    Cheers RS3-KEL

    Do you trust the figures? I would have thought that stock is a bit higher to start with. If it's really 30-40bhp, that's good as there is no remap and potentially no warranty issues?

    And does the full line push the car to the next emission tax band?
    Last edited by wickedstef; 3rd June 2013 at 16:39.

  18. #17
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    This is the list price of their kit. Most retailers will offer you between 10 -15% off.

    As you will see the full systems are recommended that a remap take place due to management light been activated, so i would assume its more than just a system change to get to the quoted figure..

    The comment is however wrong regarding the Cat Bypass pipes, as the management light is not activated.


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    Thank you Neil!

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    I am glad you lot have seen the light with the secondary CAT bypass.... I feel somewhat responsible
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  21. #20
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  22. #21
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    Quote Originally Posted by klauster View Post
    I am glad you lot have seen the light with the secondary CAT bypass.... I feel somewhat responsible
    Just ordered the pipes - due delivery Friday, fitting next Wednesday. Thanks for the detailed instructions John! Looking forward to the results of my first mod...

    Not notified the insurer yet - any experience with DL?

  23. #22
    KKM
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    Pipes fitted today, brilliant mod! Much better note! On both up and downshifts!!
    RS3 Suzuka Grey - Black optic pack

  24. #23
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    Quote Originally Posted by KKM View Post
    Pipes fitted today, brilliant mod! Much better note! On both up and downshifts!!
    Scorpion or Miltek?

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  25. #24
    KKM
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    Quote Originally Posted by Mr_Freeze View Post
    Scorpion or Miltek?
    Milltek......
    RS3 Suzuka Grey - Black optic pack

  26. #25
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    Milltek sounds to croaky ..

 

 

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