A friend of mine brought over his '06 Deluxe complainning of it backfireing and making a noise from the throttle body. The noise from the throttle body sounds like air being forced through it. It doesn't backfire of make the noise during acceleration. He said it was riding fine around town and when he got on to the freeway it started. I don't know much about fuel injection all my bikes have had carbs so any help or suggestions you guys can give would be great.