You don't say if your bike is EFI or carburated. The replies above relate to carbed bikes. On an EFI bike the EFI will self regulate the AF mixture to accommodate the snorkel removal and also K&N filter.
Removing the snorkel won't cause any damage on an EFI bike. Running lean on a carbed bike may cause damage if you are too lean.
I noticed performance gains - but I also had freer flowing aftermarket pipes.
Cheers, Richard
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09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge
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