Outer Limits 4x4 Board

OK with my GQ running on gas, and ppl telling me that the most important thing with a gas system is the ignition. So this has led me to think about upgrading the coil. Now im no expert with coils etc, but ive been told that you have to be careful with voltage, cause the wrong voltage coil can kill the rest of the ignition system. Can anyone confirm this ?

Also if anyone has done this upgrade before and can recommend a coil that would save me some research time

Thanks again.

PS. Ive already got electronic ignition within the dizzy.