Kirby I can give you some help. What a coil does is to build up voltage until enough is reached to jump a spark across the plug gap. The coil that comes on an engine will do zackly what is needed. ADDING a different coil may be a good idea if the engine has many modifications that will enable it to run at RACE rpm. However without changing the rpm range of the engine changing coils will do NOTHING for the engine..milage..or power.
If the coil is doing it's job...leave it alone.. another coil will do nothing for you.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />