This is my first turbo car. Just a quick question. Ill turn the radio down and give it a little gas......not mashing the pedal but enough to get my auto (yes auto) to shift down and then i hear what i think to be the turbo spoolin. Its like a whistlin sound and when i let off the gas and it downshifts the noise will go away. Im sure it normal but being a noob and all just want to make sure im ok.