Do you have a favorite exhaust or engine sound? A thunderous domestic V-8? The shriek of a Formula 1 car? The muted roar of a turbocharged powerplant? The big-rig huffing of a massive diesel? My favorite has to be the furious bark of the Global Motorsports Group exhaust installed on the already demonic sounding Porsche Carrera GT. I once heard an '04 CGT being driven after a clutch! replacement. Yes, clutch. The full-throttle howl reminded me of an air raid siren from hell. It was at once obscenely scary yet cool beyond words. This unique system adds 19hp and 16ft lbs of torque at the rear wheels on the dyno. What's another $6,400 on this beast. Click on the video and skip to the 54 second mark. It's THAT good. The mid-mounted 605hp V-10 in Porsche's supercar is a work of automotive art already. Unfortunately having only a 3 model-year run producing 1,270 units, it is quite rare. Some speculate disappointing sales due to it's $440,000 MSRP and not-q...