Doesn't bug me real bad. It's made the noise ever since I installed it. And yes, a coil is essentialy a transformer, but connected in reverse. Instead of stepping down the voltage, it steps up. And it outputs in pulses instead of a steady stream of current (to fire the plugs go figure). I think the stock coil is rated at 30KV, while this one is a high output 40-45KV. Stock one never made any noise. It's probably in the coil design, perhaps the core. It maybe due to a much higher voltage and the quantity of iron in the core amplifying the harmonics from the HV spark. ............. I took electronics courses when I was younger .. lol.
In another thread, I mentioned that I used plastic washers between the coil bracket and the strut tower. I "thought" it qwelled the noise a bit.. but when I took them off, I didn't notice a difference. I initially thought the washers were causing my engine to not rev up past 1/4th throttle. Turns out it wasn't the problem. There may not be much I can do, except maybe re-locate the coi. Ehhh there really isn't anywhere else to put it. I guess it's not a big deal. I haven't heard anyone else noting the same problem as I have. Maybe others either dont have the problem or don't care about hearing it and just don't say anything. Shrug.
