R1200GS performance exhaust? which pipe

Discussion in 'GS Boxers' started by Huber Tuber, Apr 24, 2007.

  1. Huber Tuber

    Huber Tuber Beer is good

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    Anyone have any suggestions on good performance exhaust systems. Notice good power increase? Get rid of that back farting on deceleration. Weight savings? Remus? Any advice welcome. I am looking for lighter and more power.. I know "well if you would just search for threads" Well maybe someone new has something to say.

    Thanks!
    #1
  2. JR356

    JR356 Long timer

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    Hi,

    Pretty much proven that you will get lighter weight and a louder sound with the aftermarket,but no significant performance increase on most BMW's!
    Still,I like Remus or Staintune.These seem to be the two most popular.

    BMW is selling Akrapovic now,as their aftermarket exhaust of choice.

    You may actually get more "farting" with some of the aftermarket units


    JR356
    #2
  3. Radar Rider

    Radar Rider Been here awhile

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    farting bikes are cool
    #3
  4. Huber Tuber

    Huber Tuber Beer is good

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    Any way to get more power out of the ol GS?
    #4
  5. Airguitar

    Airguitar Thumpin'!!

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    I have been watching eBay for chip tuning on the 1200GS, but so far nothing doing. They are either still working on something, or simply can't get any more out of the bike by tuning the performance chip. I don't know...
    The only other performance enhancement I've seen is complete motor rebuilds with special camshafts, valves, etc. which of course will lower your bike's life expectancy, and maybe your own along with it.
    I do notice that the HP2 has 105HP and the HP2 Megamoto has 110HP, compared to the 1200GS's 98. Where they get the extra horses from on those models, I don't know, because the engines seem to be the same as the 1200GS.

    Now wasn't that the longest "Dunno" you ever got ?? :evil
    #5
  6. st247

    st247 Been here awhile

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    #6
  7. JimVonBaden

    JimVonBaden "Cool" Aid!

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    You will get more out of a crack pipe than one for the boxer!

    And it will be cheaper too!:lol3

    Jim :brow
    #7
  8. GB

    GB . Administrator

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    Removing the cat and stock exhaust will only make the burping / farting sound louder.. if you want more power, you need to get a different bike.
    #8
  9. Flyboy08

    Flyboy08 Been here awhile

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    So true, as it does on my GS with the Remus....Sounds Koooooooooool:evil
    #9
  10. Bounce

    Bounce Long timer

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    In addition to the kewler sound, my Remus full exhaust gives a somewhat better performance over the stock. Seat of the pants feel is a little more Hp, but most of that could simply be due to removing the cat. The major improvement is that accelleration is smoother throughout the rpm range, most noticeably in the lower range. The exhaust definitely farts more on decel. If you only had around $1k to spend on performance farkling, aftermarket shocks will give you the most buck bang on the 12gs. That said, the aftermarket exhaust does provide a bit more fun.
    #10
  11. NLS

    NLS My bike needs washing...

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    I think we need to make a nice thread calling all people that have in fact tuned their 12GS somehow and categorize them. Make a FAQ or something.

    From the top of my head we have:

    Snorkel modified or not
    Performance Controller or not
    Blue or K&N filter or not
    Aggressive camshaft (Wunderlich Boxer Boost) or not (does anybody HAVE this?)
    Light cam buckets or not

    New headers:
    Acrapovic
    BOS
    Remus
    Wunderlich own (?)
    (other?)

    Exhausts:
    Acrapovic single
    Acrapovic twin
    BOS
    HPE TwinBoost
    Hurric
    Remus
    Sebring
    Staintune
    WRA Edition (Wunderlich custom)
    Zard PowerGun

    ...anything else?

    So maybe create a nice thread to collect those things and get some info?
    #11
  12. JimVonBaden

    JimVonBaden "Cool" Aid!

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    More importantly, Dynos for each before and after to show some kind of proof they work, instead of "seat of the pants" dynos which are heavily influenced by how much was spent, and how much the person likes the sound changes!

    Otherwise, all these changes have no real validity as performance enhancers. Only what people FEEL, and not necessarily reflecting reality.

    Jim :brow

    PS And not dyno charts from the manufacturers, as they will always skew reality their way. Independent only!
    #12
  13. dlew

    dlew Daypass Adventurer

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    My experience is the same with Remus header and can plus Blue filter but with the addition of the Wunderlich/Techlusion P.C. it seems even smoother and more powerful AND I am not getting the deceleration popping.

    Bike is definitely more fun and I can't help but ride it harder but is using more fuel, needless to say. It's not been dyno tested but the fun meter went up two points.

    YMMV, so to speak.

    [​IMG]

    [​IMG]

    [​IMG]
    #13
  14. st247

    st247 Been here awhile

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    Dyno results are a problem area as far as measuring results go. The variables ( Air temp, Humidity, Operator Experienced or Not etc ) mean that the same bike is quite likley to get different results on different days, or on different dyno's. Manufacturers figures have got a lot better over the last few years, and i'd say they were pretty near these days. One of the bike mags over here dyno'd a 2-1-2 Akrapovic on the 1200gs and it did exactly what Akrapovic said it would. Harris Performance - https://www.harris-performance.com/website/acatalog/index.html?https%3A//www.harris-performance.com/website/acatalog/BMW_Akrapovic_Exhausts.html&CatalogBody
    a well respected builder of Moto GP frames, and runner of a number of WSB and BSB teams are quoting an expected gain of 14 BHP @ 7,760 RPM for the 2-1-2. Doesn't sound too bad too me, untill you work out the £ to BHP ratio.:huh
    #14
  15. SQD8R

    SQD8R Eat squids and be merry

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    Akrapovic
    BOS
    Remus

    In that order, if considering performance and weight. :thumb
    #15
  16. NLS

    NLS My bike needs washing...

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    I don't disagree, just would like to ask how you came to this conclusion.
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  17. JimVonBaden

    JimVonBaden "Cool" Aid!

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    Of course you always use the same dyno before and after, or the results mean nothing.

    14hp for an exhaust alone is impossible. The fuel injection and air filtration would both need adjusting, and even then it is doubtful thaqt much could come without internal mods.

    None the less, it still remains that you must do before and after dynos, same machine in similar conditions, to show effective and provable gains.

    Just my opinion, and worth what you paid for it!:deal

    Jim :brow
    #17
  18. SQD8R

    SQD8R Eat squids and be merry

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    No problem,

    I've owned all three, albeit not on my 12GS, and I've seen and heard all three on a 12GS.

    My 12GS had a Remus system. A good system but the build quality award goes to Akra IMO.

    PB tested the Remus and Akra and found the Akra fuelling pretty close to perfect while the Remus had some lean spots which their independent dyno tester Marc Brewin of BSD, builder of BSB privateer Superbikes, felt required a power commander type of system to correct the fueling. Also the Akra made more power and was close to what the Akra web site claimed the BHP would be. The Reums was also close to its claimed BHP.

    The BOS system is a bit of a dark horse in that it is not well known but IMO the build quality looks better than the Remus, the price is lower, and the claimed performance is in line with the Remus and Akra claims; nothing outlandish but decent gains.

    Again this is only considering dyno tested performance per PB and manufacturer claims and also weight loss.

    I won't debate the real added value of the systems since the hundreds of dollars per bhp is not much of an arguement. :lol3 Also dyno testing involves way too many variables to be taken as the sole motivator. If you just consider tyre properties in a dyno test you have to consider the type of tyre, the qualities (performance level) of the tyre in order to get the power to the dyno wheel, the tyre pressure, wear, etc. This is just tyres. :huh
    #18
  19. jalal

    jalal Adventurer

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    I did not know till now that BOS made a header for the R1200GS:

    http://www.bos-exhausts.com/bmw-pdf/b08.pdf

    how does that compare to the Remus headers (quality, price, performance) ?



    #19
  20. Huber Tuber

    Huber Tuber Beer is good

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    I did just blow some cash on Ohlins rear! Can't wait to put it on. As far as exhaust, seem my local SJBMW Dealer owner Chris is a master of performance enhansement for boxer motors. Looks like they are actually winning races. I will see what he has to say and get back to ya.

    www.sjbmw.com
    #20