IT was a hot day and I had the windows up... I was at a light and it turned green and I romped on it. As I approached 5500 RPM, I went for the shift, but inbetween shifts I heard a bov-like-noise. I was like, WTF?! I dont have the turbo enigne in there yet!? So going into third gear it did it again. Whoa! Then I started thinking. I remembered reading in the sevice manual that the ECU disengages the AC clutch under WOT condition, and when I was letting off the gas at high RPM, the AC clutch would engage and it would slip for a second making this Shshhhhshhshtttttt! noise. I got a grin from cheek to cheek..