I dunno, the sound of the AD2 when the ignition comes on kinda lets me know I'm driving something just a little more serious than the average rig, puts me in the mindset to be behind the wheel of this beast
besides that, I never hear or notice it once the pistons are moving
:thumb:
That's a pain in the ass how will you ever know its not working until its too late. Like Jason, I also prefer to hear mine with the key on until I start it then I don't hear mine at all.