I have a reciprocating/resonating wavy bass sort of noise at 3000rpm and above. rav4 2003 2.0L. No vibrations, no ticking noise. The noise isn't that loud, but consistent. Checked engine mounts all good. Checked for any loose heat shields all good. Right when I let go of the gas it goes away, even at 2900rpm. It sounds related to intake or exhaust.