You really don't need to change the coil as the OEM one is fine but the OEM wires are junk. Sooner or later and usually sooner the wires go bad. I haven't seen anyone say that changing the coil did anything for the car.
Hope this helps.
It all helps thanks,looking towards the next service for best value for money & the coil varies from $25 - $140 as do the leads . I was quoted $200 (std genuine leads only) at the Chrysler service center & thats not going to happen at that cost.