The Audi bolt-down ones are good. I replaced the push-down coils that had a failure about every year or two with the bolt-downs just a week or so befor VW announced the recall. Zero, zero, zero problems ever since.
I have used the blaster w a stock icm (the inductive version) and also with a 6al (cdi version). Both worked well over for 400whp with a stock dizzy.
I have an MSD blaster 2 coil on my 93 fox and it works great. I went with this coil for convenience (bought at a FLAPS when my stock coil died) rather than performance, so unsure if there are any gains to be had (doubtful).
after you check the dwell and all wiring looks good, it may help to switch to a different coil like the MSD Blaster 3.
I've had similar spark plugs fouling up issue with the G60 turbo swap in my caddy. After checking all the stuff you mentioned, I upgraded to an MSD Blaster 2 coil and NGK plugs with a wider gap (0.030). So far so good, running on all four cylinders now.
So far I've replaced all ignition coils (1 died while I was test driving the car, the other 2 years after in the winter, of course). I decided to replace them all with non-faulty Audi parts instead of doing it every year.
I had a intermittant misfire that wouldn't go away.. changed out coilpacks, plugs, wires, nothing made a bit of difference. Installed the MSD coilpacks, and the MSD wires and viola, misfire was gone. Regardless, the cost of a stock coilpack + wires far exceedes the cost of the MSD setup.
Mine is working exactly as it should !!! My cam follower is wearing thin, my DV is busted, my PCV leaks just fine, and i'm starting to think my coils are also going bezerk (but thats fine cause it about that mileage)...
MSDs are good coils and are meant for racing and not daily abuse. I will guarantee that after time it will crack due to the engine heat, use, etc. May not be for years, but eventually it will.
I have used the MSD ones before but they will fail much faster.
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