What causes the chirping noise (it sounds metallic) and does it cause any harm beside sound? How does air induction cause a sound like metal hitting together? I got DRMD's Ramair and I like the exhaust sound volumn (minus the metallic chirp) but don't want to damage the engine. Could a dyno reduce or eliminate the unwanted noise? Anyone know of someone in the Dallas Tx area that does a good dyno and tune for the Rocket? Thanks for any info.