international markets. New style front seats. Redesigned more modern looking door panels installed when multi speaker stereo was ordered. Gearbox synchromesh changed to BorgWarner design and shorter gear lever, improving driveability on manual transmission cars. Shims left out from front end of torque tube drive plate in automatic transmission cars, this sometimes cause engine thrust bearing failures. Radio antenna moved to embedded windshield wire. 1986 Model designation: 928 S / 928 S2 (UK) Engine displacement: 4.7 L (286 cubic inches) / 5.0 L (302 cubic inches) (North America, optional elsewhere) Valves: Two per cylinder (four for North America, optional elsewhere) Power: 310 PS (306 hp, 228 kW) (worldwide) / 292 PS (288 hp, 215 kW) (for North America) / 288 PS (284 hp, 212 kW) (for Australia, optional for Germany, Austria, Japan) Changes: Lowered 9.3:1 compression ratio four-valve engine optional for some markets along with catalytic converter, standard in Australia. Compression change was done with different shape piston tops. "S4" suspension package and Brembo brakes for 1986 models (from VIN 1001 and November 1985 onwards in North America). No U.S. models made with VIN ending between 0938 and 1000 due to parts change. ABS brakes became standard for all markets during model year production. 1987 Model designation: 928 S4 Weight: 1590 kg (3500 lb) Engine displacement: 5.0 L Valves: Four per cylinder Power: 320 PS (316 hp, 236 kW) / 300 PS (296 hp, 221 kW) for Australia. Changes: Different style pistons, cylinder heads, camshafts, intake and larger intake valves compared to earlier 5.0 L engines. Nominal static compression ratio 10.0:1 (True ratio between 9.4:1 and 10.0:1, depending on parts used). Cylinder head studs used in all earlier engines replaced with bolts making it easier to remove heads while engine is in engine bay. Updated LH-Jetronic injection and ignition changed to EZK system, two knock sensors added to engine. Single disk clutch on manual transmission cars, larger torque converter on automatics. Modified front brake calipers used with 2 mm diameter increase for larger pistons. Cars sold to U.S., Canada, Australia and Arab countries got new parts once remaining old design calliper stock was used up. New style front & rear bumpers and rear wing spoiler. Older style S wing still available as option M471. This is the same option number as 1980-82 Competition Group. Porsche has used same numbers several times in different model years and models. In different years