No wonder everyone has been raving over the GT350 exhaust. It's artificailly enhanced inside the vehicle, a la BMW. Though this doesn'the affect whats heard outside, For a purist type car, this seems really cheesy to me. I stumbled upon this info on a neighboring mustang forum. This is quoted from a Ford service document.
"ESE - 2.3L And 5.2L ESE is an audio system feature that enhances certain engine tones typically induced under wide openthrottle or heavy part-throttle conditions. The system uses a DACMC (contained within the ACM) and theaudio system speakers.The DACMC determines the engine tone to enhance based upon engine rotation speed data, engine torquedata, and accelerator pedal position data from the PCM. The data from the PCM is processed and convertedinto an analog audio signal, transmitted to the DACMC internal tone generator, and output by the ACM to theaudio DSP module as fluctuating AC voltage. The audio DSP module sends the signal to the LHF and RHFdoor midwoofer (without Shaker) or woofer (with Shaker) speakers and right and left parcel shelf (with 5.2L)speakers as fluctuating AC voltage."
"ESE - 2.3L And 5.2L ESE is an audio system feature that enhances certain engine tones typically induced under wide openthrottle or heavy part-throttle conditions. The system uses a DACMC (contained within the ACM) and theaudio system speakers.The DACMC determines the engine tone to enhance based upon engine rotation speed data, engine torquedata, and accelerator pedal position data from the PCM. The data from the PCM is processed and convertedinto an analog audio signal, transmitted to the DACMC internal tone generator, and output by the ACM to theaudio DSP module as fluctuating AC voltage. The audio DSP module sends the signal to the LHF and RHFdoor midwoofer (without Shaker) or woofer (with Shaker) speakers and right and left parcel shelf (with 5.2L)speakers as fluctuating AC voltage."