Enhance Ignition Performance with ACCEL 140043-8 SuperCoil Set (Pack of 8), Yellow Review

Great Coils! Direct install/replace with Silverado 5.3 2016. No gasket or longer screws are required. Add to that a set of ceramic wires for a more responsive throttle body.

2001 Chevy 2500hd 6.0 Will not fit stock square coil holders. New fasteners used, M6-1.0 35mm flanged bolts with 1/2" spacers. Fits well, all fitCoils work as they should.

They are great, HOT coils. Gasoline consumption and power increased, but one of them stopped working. Only the 90-day guarantee due to the set is rather weak.

They don't fit the 03 Silverado 2500HD, work great and increased MPG by 2 MPG with combo leads, but spark is hotter than required and will burn through spark plugs if not upgraded for power .

It's frustrating. I bought these as an upgrade to the original coils to fully tune them, even after a week they won't fire! I'm taking my truck to the dealer to see what's up and they said these coils are bad, "they're blown".

I had two problems with the engine. 1) The engine was shaking 2) Acceleration was slow and did not allow maximum power. Both problems have now been fixed. Also, my cold weather starts right away (temps in the mid 20's). I had no trouble starting in cold weather, but now it starts faster than before.

These coils are fake. I have never replaced a coil or coils on a vehicle that would give me a noticeable horsepower boost. I always assumed it was a publicity stunt, but not a reality until now. The throttle sensitivity and throttle release on my trucks is amazing. It surprised me like I was driving a different car. I would recommend them to anyone using standard roles. I waited for the price to go down so I ended up paying about half their normal price but if I had known the difference they…

First; It wasn't a direct bolt-on fit, I had to go to a hardware store and buy 0.5" spacers and 0.5" longer screws. They work great; increased throttle response (power/torque) and increased fuel efficiency (2-4 mpg) just what I was looking for. Depending on which website you go to you will get conflicting information on how to install these coils. My application was for a 2004, Chevy Silverado 2500, 6.0 liter. Many websites said they didn't fit but looked like they did. When searching for…