spark plugs coils

Ok :read:, so i Keep getting the Magazine article from Bavauto and it always shows me these "High performance ignition coils" on sale. What are these? does any one have these and see any sort of a difference in a gain of power?:hmm:

i have an 02 325ci with 62,000 miles on it and about 2 months ago i got a CEL light and my car goes into limp mode. i take it in and i got the codes p1343 code which is cylinder 1 misfire and fuel cutoff. heres the thread i made about that...