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Old 12-08-2012, 06:57 AM   #3
dutch97501 OP
Gnarly Adventurer
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Joined: Apr 2007
Location: Medford Or
Oddometer: 114
If you are talking about what I think you are it's sound waves backing up thru the heads and intake blowing fuel into the air cleaner. I have seen this first hand with a strobe light and a Harley with aftermarket pipes. The 1200gs with its y design create a scavenging effect that keeps this from happening that coupled with the 1200 cat being so small makes it unlikely you would encounter this the problem I see with gutting the cat on the 1200gs is if you have no way to correct the fuel map you would worst case burn your motor up best case make less bhp due to the lean condition. I have no regret in having the ecu remapped and cat removal. The bike also has a k&n air filter and a Offenbach muffler
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