Re: SML: Jacobs Electronics ignition coils. Anyone experience these?

[SuprSentra]

 I'm considering the Jacobs Electronics ignition coil. For about $300 (in my
 case) they say it gives you a good increase in gas mileage,  hp, engine
 reliability and engine life, and also helps the engine run a lot cleaner in
 California (heavy duty plus at smog check time).

HEY GUYS AM I WRONG HERE, i thought these coils didnt do anything for our cars.?