1. per discussions here, i recently replaced my original equipment Champion A-6GC with the modern design iridium NGX DCPR9EIX. 2. i purchased same at oreily's @ about $6.75 each. 3. i notice a little better performance 4. mostly i notice the 7/12 check engine light is not coming as before. now it is very infrequent. 5. this is great fcar. mucho gusto. 162 on the passport gps.