I just replaced my plugs and am looking at wires and a new distributor... my car is at 101k and i think its time to start making some changes to help it run longer... i was looking at the msd power tower distributor cap... is this worth it at all? it says it allows you to run an external coil, so does that mean i would NEED to buy an msd blaster coil or would the cap itself be good? what is the best setup? i dont necessarily expect any power or anything out of this, i just figure if im upgrading it, i might as well spend a little bit more and make it a good upgrade... thanks