I agree with the above statements that the higher output coil won't cause any failures. My MSD coil only lasted about 10K miles before it crapped out but any manufacturer can have issues. I replaced mine with a Crane coil and it's been fine for the last 40K miles.

 

Actually I had a Blaster Coil and it went out on me after only about 3 months. I bought an Accell Coil and it lasted.

 

Took out mine MSD went back to the oem and the car felt better.