This is probably a question for Scott and Kirby or anybody else that has tried this, is there any performance to be gained by installing an aftermarket coil or the coil on plug set up? I did a search and only found one thread that said to not waste the money.
I have an all bore 2003 FI 107 with 120+ hp and torque.
Another question that just came to mind, I am running 5.3 injectors, at what point does it pay to move to the 6.2 injectors?
Thank you.

 

An aftermarket coil will provide you with a stronger and more consistent spark over the stock coil. I've had the best luck with Dynatek products. In my opinion the only answer to the injector question is a run on the dyno. This will tell you if your current fuel pump/injector set-up is giving the motor what it wants. A good tuner will make the bike run great but you will not see the full potential if the motor is starving for fuel under heavy load. Hope you have a timken conversion and welded crank for those numbers!!

 

Thanks for the feedback on the coil. I thought they would be better than the stock unit.
Oh yes the bottom end had the full Darkhorse treatment.