[fred cook]

Actually, if you have a Porsche that used a 6 pin CDI box then you don't need to "cut into" anything. When I installed an MSD 6A in my 1980 SC (the Bosch unit had failed), I used crimp on male terminals and simply plugged the MSD into the stock plug on the cars' wiring harness. That way, if I or a future owner decides to go back to "stock", it will be a very easy and painless process.

As to the functionality of the MSD, I also believe that the MSD makes for easier cranking and a smoother idle. And, my car at least pulls very strong right up to 7,000 rpm where the rev limiter cuts in.

So, what we have here is 1) easy to install, 2) works well and 3) cost much less than even a rebuilt Bosch CDI. I have had the 6A unit in my car for 6-7 years and it has worked perfectly during that time. Sounds like a winner to me.