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Thread: To 3" or not 3" ?

  1. #21
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    Quote Originally Posted by thestu View Post
    ..worked out that the original polo exhaust was the bomb (perfect).
    ..really? bugger me - well that settles that!

  2. #22
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    You are all a bunch of school girls.


    Part of owning your own car is the pleasure of being able to make your own decisions as to what you do and dont do to the car.

    I think this thread should be locked up.
    GTI. Leather.
    tint,Eibach pro-kit,Whiteline adjustable swaybars,Forge s/brace,BMC,Forge T.I.P & D.V, Cupra R, APR. EBC & 3''dump pipe

  3. #23
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    Quote Originally Posted by thestu View Post
    i dunno if anyone knows guy harding
    guy harding? nope, never heard of him.....oh wait, is he the guy that posts on here all the bloody time

    personally, i like the sound of the stocko exhaust so i will be sticking with that. if i was to upgrade however, it would be to a Milltek 2.5" cat back.....mmmmmm

    2010 Reflex Silver MK6 Golf GTI
    Sunroof - MDI - Superchip - 19" VMR V710 - Kuhmo Ecsta SPT KU31 - VW Racing Panel Filter

  4. #24
    Quote Originally Posted by GT3 View Post
    When someone else can reproduce the results you got with a 3" DP on a stock Polo GTI, then that would make it two substantiated cases, which is better than one! Even then, peak power figures on a dyno are meaningless on their own. The loss of low-end, loss of boost, distorted power bands, poor AFR etc etc are all equally important.
    I have the REVO Tune on my Polo GTI like Timbo. I also have had a custom 3inch DP installed by Castle Hill Exhausts.

    From driving my car since the DP mod, it has not lost any power down low.

    The car now comes on boost harder and faster than before.

    The improvement in the cars midrange is fantastic, the extra torque overpowers the front tyres far more reguarly.

    The REVO tune's most impressive improvement IMO was the cars increased mid-range torque. With the 3inch DP it simply has even more.

    Tims results of around 10-12kw at the wheels is accurate IMO.
    MATT / SYDNEY
    POLO GTI / REVO TUNE / INTAKE / EXHAUST

    300BHP 323 GTR / 550BHP R32 GTR / 350BHP EVO VI

  5. #25
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    At the end of the day, it comes donw to your own hard earned cash...If your happy with the mods you have dine ti your own car, then so be it...Add a 2.5inch, 3 inch, 15.55327 inch pipe...as long as you are happy with it, go for it, cos at at the end of the day, unless you are a really sad case that relies on your parents for your spending money, you don't deserve to have a car...
    Last edited by Blitzen; 25-07-2008 at 04:19 AM. Reason: I'm pretty drunk....So sue m!!!
    "If can't get behind your troops, feel free to stand in front of them..."

  6. #26
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    Guy himself did tell me when I looked at the prototype of the full APR Polo GTI exhaust, almost 2 years ago now, that it made all of 1kw difference on the dyno.

    I was very keen on buying one and loved the sound. But to me $2000+ for 1kw was not worth it.

    I did love taking the K04 red beast for a drive though and plan on doing the K04 next year for sure.

    As to an exhaust, I'll take my time and also try both a 2.5" and a 3.0" dowpipe before committing. Even if it means driving to Newcastle ....

    Mmmm, maybe I should ask Guy if I can do a trial ..... on the dowpipe that is....
    Current: 2023 MY23 T-Roc R Lapiz Blue + Beats Audio + Black pack 2018 MY19 Golf R manual Lapiz Blue + DAP) 2018 MY18 Golf 110TSI (150TSI) Trendline manual White2014 Amarok TSI Red (tuned over 200kw + lots of extras) 2013 Up! manual Red 2017 Polo GTI manual Black Previous VWs and some others ...

  7. #27
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    Quote Originally Posted by Sharkie View Post
    Guy himself did tell me when I looked at the prototype of the full APR Polo GTI exhaust, almost 2 years ago now, that it made all of 1kw difference on the dyno.
    Sharkie, keep in mind that when I bolted the same full 2.5" exhaust on my Polo GTI, it gave another 12.5 kw atw. ..and I think your approach is right, go with what works, test it (not just on a dyno) and see for yourself.

  8. #28
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    Quote Originally Posted by [-Polo GTI-] View Post
    guy harding? nope, never heard of him.....oh wait, is he the guy that posts on here all the bloody time

    personally, i like the sound of the stocko exhaust so i will be sticking with that. if i was to upgrade however, it would be to a Milltek 2.5" cat back.....mmmmmm
    haha ohhh sorry guy i used to work at volkspower you have probably seen me around.

    but it is true yes the apr exhaust lost power?

  9. #29
    I suppose the only real way to tell is to get the same car & try two downpipes on it, back to back

    When we did it back in 06' our exhaust developer built 3" reducing to 2.5 catback & 2.5" all the way through. He ran dynos on both (back then) and there was power from both, and he found significantly more low & mid range from the 2.5, but the 3" passed it at (from memory) 5000rpm & provided more up top. The torque dropped off in the 3" around 4200rpm, where the 2.5" held it until after 5000. Then he put the standard rear exhaust on & we found little difference in the power output. We have not use him since 2006 ( He exclusively does off road 4WD systems now), but I sent him an email to see if he had the original dyno's from testing & if I can go pick them up.

    We also did a heap of testing on the MKIV Golf back in 05' with 3" & 2.5" & found pretty much the same results - one thing on the MKIV though was the internal cabin noise almost doubled with the 3" piping!

    If anyone has a 3" system, it will be interesting to overlay the curves of where it makes it's power compared to 2.5" when we do the polo dyno day in August.

  10. #30
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    Quote Originally Posted by Guy_H View Post
    If anyone has a 3" system, it will be interesting to overlay the curves of where it makes it's power compared to 2.5"
    I've done just that - overlayed all runs with each respective DP modification:

    - Base dyno/stock exhaust (Blue)
    - 3" DP (Red)
    - 2.5"/3"DP combo (Pink)
    - 2.5" DP (Black)

    There were three runs each time. Rather than use runs that simply spiked or peaked, we selected the most representative (average) run of each three and charted them.

    While the figures may appear low, it's coming from an average base dyno of 116 kw atw. I won't comment on the chart other than to say that (with my car) the 2.5" DP provides as much power as the 2.5"/3"DP combo, with the difference being (on the street) it has much more usable power down low and mid-range.


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