A5 Research and Development has yielded an exhaust and downpipe that is remarkably civil while idling / part throttle cruising, but unleashed at full throttle it produces what some have called a "war-cry wail." Sophisticated,...
A5 Research and Development has yielded an exhaust and downpipe that is remarkably civil while idling / part throttle cruising, but unleashed at full throttle it produces what some have called a "war-cry wail." Sophisticated,...