My 8 has trouble starting up after sitting for a whole and has misfires alot will starting up I bought the extended warranty . And I went to the dealer and they said coils spark plugs and wires are not covered cuz of my AEM cold airintake. So what does warranty really cover then cuz it seems like a waste of money now

 

The parts you mentioned are considered tuneup/maintenance parts...they're never covered by extended warranties.

 

I also think so, It will be very useful if it is in that design.