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Old Dec 16th 2016, 10:29 AM   #1
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1299 exhaust modification

Hi,
I know this topic has been covered on numerous occasions but any views or educated advice on moding the standard 1299 cans
I have planned to core the cans completely and have a section of 50mm stainless perforated exhaust piping placed surrounded by exhaust wadding. Any suggestions on piping diameter considering standard headers 60mm. Decided on 50 but someone will hopefully shed some info on this.
I have a rapid bike module already fitted and would like advice or info on the likely outcome on fuelling and power output.
i will eventually run the bike on the dyno but that will be in a few months , making do with checks on the AF ratio when the pipe is refitted.
Cheers

Last edited by Johnnyflies; Dec 17th 2016 at 12:33 PM. Reason: Additional info
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Old May 16th 2017, 08:01 AM   #2
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Bike goes on dyno first dry day

Low rpm fuelling smoother and noise very akra like deep but not offensive.

Will post dyno when sorted. Bike not long run in so I'm in no rush to dyno it.



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Old May 16th 2017, 08:29 AM   #3
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Old May 16th 2017, 08:30 AM   #4
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Old May 16th 2017, 10:32 AM   #5
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Why?
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Old May 16th 2017, 10:32 AM   #6
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1299 exhaust modification

Well cheaper than an akra!!
Should perform like a race can so better than coring. Wide bore stainless inners almost twice stock internals meaning much less restrictive and has some baffling so it's not hideously loud. Length of effective exhaust pipe work is retained / increased so in theory should have beneficial effect on gas flow ( wavelength / resonant frequency of the exhaust ).

Why not ?


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Last edited by Johnnyflies; May 16th 2017 at 10:47 AM.
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Old May 16th 2017, 10:36 AM   #7
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I Ride: 1299 Anniversario #81
Looks good, nice job! Let us know how the dyno goes.
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Old May 16th 2017, 11:23 AM   #8
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Nice work! Would love to hear a sound clip when you get it bolted up.
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Old May 16th 2017, 11:36 AM   #9
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Originally Posted by HiSpeed48 View Post
Nice work! Would love to hear a sound clip when you get it bolted up.


Cheers. I will post a clip as soon as possible.
Sounds really good , a lot louder than stock but not offensive.


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Old May 16th 2017, 12:58 PM   #10
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Your RAPIDBIKE module should adjust fuelling without any need to do anything. Couple of hundred miles and should close to perfect. I bolted up a much more radical full system to mine with air cleaner and massive runner tubes and went fine. I'm actually catching up with a tech from RapidBike factory in a couple of weeks to run through everything.
Have you the EVO RapidBike fitted ?
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