I'm going stage 2 this coming week, and I think I should upgrade the spark plugs. I did some research and found OEM is actually best until you reach a certain level of power over stock. Apparently it's the one thing manufacturers do a lot of research to optimize performance. I don't fully understand it all, but I think I should go 1 step cooler. At stage 1 high torque by IE, I do not have any issues. I had stage 2 by APR on my A3 and I didn't upgrade the plugs. Didn't have issues. Is there a benefit to doing this? Any power, throttle response, etc or does it just make it run properly? Also, why would one upgrade the coil packs? I don't really understand what they do, just know I don't want them to fail. Also, if you have done this mod please recommend products.
Looking at these:
https://www.ecstuning.com/b-assemble...06h905110lkt3/
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