High-performance air suspension compressor designed for durability. Arnott's air suspension compressor for your vehicle (7L), Q7 (4L) and the Porsche (9PA) is a direct replacement for the original OE compressor. The compressor comes complete with a mounting bracket, integrated air dryer and electrical connectors for a fast plug and play installation. The most common cause of compressor failure is a leak in the air suspension system such as the rubber air springs.