I just burned out my seond set of spark plug wires courtesy of my MSD 6A box. The first was a stock replacement type made by Bosch that lasted about 3 months before the radio started acting up,the engine started missing and my SDS started throwing error codes. After some trouble shooting to find the problem I searched my "inventory" and found a set of 8mm Taylor Spiro-Pro wires that I bought about 10 years ago. Put them on and all problems were immediatley solved,for about a week. The Taylor wires are really good quality and I used this set successfully with a MSD long ago so I'd have to guess the failure was due to age. Moral of the story is if your going to use a high output ignition save yourself the trouble and don't put a $20 set of plug wires on your engine. Better yet if you aren't running a turbo or ultra high compression don't bother with any ignition add ons since they are just a waste of time & money.