well i see you have a honda, so if you buy a msd 6a your gonna have to buy the coil and cap(or get the honda cap from a 89 accord) cause the 6a taps into your stock coil connections and you have to remove the stock coil, at least i dont think the 6a is compatile with stock units, i havent had any experiences with any thing other than msd , plus its worked great on my car and i have the 6a with seperate coil and msd cap, the only bad thing about the 6a is you cant use any other cool shit with it, like the 2 step box or anything like that, you have to uprade to at least the 6al to use any of the accesories which kind of sucks but all in all its a good setup and will definitely be worthwhile ........