I just put a new msd 6a box on my mustang and I can hear a clicking sound coming from underneath the hood. I checked for an exhaust leak but it checks out, and I remember hearing somehwhere that they are notorious for making a sound like that. Am i crazy or is it that msd?

 

i dont think my 6AL clicked, but i wouldnt have heard it if it did over my exhaust[&:]

 

msd ignitions make a very fast clicking noise that is proportional to rpm's. its normal, but not loud or anything, i have mine under my pass seat and i only hear it at idle and i have to be listening for it.

 

More like a buzzing sounds that as preciousroy said is directly related to rpm.

 

my car does the same i have msd and same **** so just ignore it your ok