He's right - it's nothing to worry about. I found it a bit annoying and wanted to get rid of it. I was more concerned about getting rid of the EFI snatchy throttle that the AI and O2 sensors make considerably worse.

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