check all conns and make sure they are taped very well. Also if you didnt do it, the grounds to the MS should be run to the battery ground on the strut tower. Also some people reported that the MS touching metal of the vehicle created ground noise so make sure that isnt your case.

If all that is good you want to look into why your crank signal is noisy.
The MS itself shouldnt be an issue, you have the v2.2 and that unit was tested on my car with no spikes.


Terry