Can i add at this point that whilst it's been documented that i too have a whistle every now and again with my Twintake, i do not get THIS kind of high-pitched whistle. When i plant my right foot, i hear ONLY a spool up and my exhaust coming to life! Yes, this would very much get on my t*ts too!! My whistle (much quieter than this) only happens at low revs and at low speeds...