I don't know why they keep doing this. They took quite a bashing years ago on the Mustang forums when they pulled this stunt. The only way they would do any good is on a highly modified engine with boost. And even then you're not likely to see any hp gains...at least nothing noticeable. If anything it may help smooth out the engine idle or something. But they don't last as long as factory coils. I had Accel coils on my Mustang back when I was runing a fully built engine with heads, cams, and 15 lbs of boost. It actually did good. But after about a year or so those coils began operating miserably. My engine would back fire, misfire, hesitate, everything. I had no idea it was the coils at the time. I changed the EGR, IAC, TPS, intake manifold gaskets, 2 sets of spark plugs, tuned and re-tuned it and nothing worked. Finally I put the stock units back in and the car ran perfectly. I tried cleaning the Accels and re-installing them and they still ran horrible. They ended up in my dumpster. Close to $400 gone for nothing. Never again...
2017 Camaro ZL-1 A10
2013 Jeep Grand Cherokee Hemi 5.7 - Tuned!!
Proud to be the March 2013 Member Of The Month!