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Thread: Pro's and cons Gen 4

  1. #11
    1 YEAR PREMIER MEMBER RammyRR's Avatar
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    Re: Pro's and cons Gen 4

    Quote Originally Posted by Schuey View Post
    Your feedback on the sound saddens me
    The monster cat is the issue - I reckon it’d sound no louder without any can attached! A full system would sort it. My 3 sound great with just a Yoshi LE55 can.

  2. #12
    Standard Member TheGodfather's Avatar
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    Re: Pro's and cons Gen 4

    I heard 2 bikes in Spain with full systems and was dissapointed, but having had a full one put on mine it sounds awesome, so don't know what was going on with theirs.

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  4. #13
    Standard Member Schuey's Avatar
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    Re: Gen 4

    Quote Originally Posted by Richinio View Post
    I stuck an Akrapovic end can on mine, disconnected the exhaust valve - sounds good now.
    Please explain to me the function of the exhaust valve and how does it benefit the sound by disconnecting? Thanks.
    2016 BMW S1000RR Sport 199bhp (Current)
    2012 BMW S1000RR Sport (Sold)
    2006 Honda CBR1000RR Fireblade (Sold)
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  5. #14
    Standard Member bananaman's Avatar
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    Re: Gen 4

    Quote Originally Posted by Schuey View Post
    Please explain to me the function of the exhaust valve and how does it benefit the sound by disconnecting? Thanks.
    Ordinarily the valve I believe is shut until higher revs due to noise brigade
    Speed doesnt kill, its how fast you stop.......

  6. #15
    Standard Member Richinio's Avatar
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    Re: Gen 4

    Quote Originally Posted by Schuey View Post
    Please explain to me the function of the exhaust valve and how does it benefit the sound by disconnecting? Thanks.
    If you look at the link pipes between the cat and the end can, you will notice their are 2 pipes - one wider than the other.

    A valve completely closes off the wider pipe at low revs and partially closes at medium revs. When the exhaust gases are restricted to flowing through the smaller pipe, the sound is significantly reduced.

    If you disconnect the valve (by unhooking the servo cables), the valve remains permanently open - so the exhaust sound is unmuted throughout the entire rev range.

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  8. #16
    1 YEAR PREMIER MEMBER RammyRR's Avatar
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    Re: Pro's and cons Gen 4

    Quote Originally Posted by Richinio View Post
    If you look at the link pipes between the cat and the end can, you will notice their are 2 pipes - one wider than the other.

    A valve completely closes off the wider pipe at low revs and partially closes at medium revs. When the exhaust gases are restricted to flowing through the smaller pipe, the sound is significantly reduced.

    If you disconnect the valve (by unhooking the servo cables), the valve remains permanently open - so the exhaust sound is unmuted throughout the entire rev range.
    Does this throw up any dashboard errors?

  9. #17
    Standard Member Richinio's Avatar
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    Re: Pro's and cons Gen 4

    Quote Originally Posted by RammyRR View Post
    Does this throw up any dashboard errors?
    Just unhooking the cables causes no visible errors.

    Removing the servo that moves the cables does throw up an error, I believe.

  10. #18
    Standard Member bananaman's Avatar
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    Re: Pro's and cons Gen 4

    Speed doesnt kill, its how fast you stop.......

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