German tuning outfit G-Power has just revealed a new aftermarket package for the \'old M3,\' adding a large ASTA T1-518 centrifugal supercharger that boosts output from 343hp and 269lb-ft to 450hp and 339lb-ft of torque.The result of having an additional 107hp is performance figures of 0-124mph in 14.7 seconds (down from 18.1) and a top speed in excess of 186mph.The tuning package includes 20-inch \'Silverstone Diamond\' alloys and a coil-over suspension.The M3 also gets G-POWER braking system with 370mm brake discs up front and 342mm at the rear, and a stainless-steel sport muffler with \'DEEPTONE\' technology that produces an throaty engine note.