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

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 engine information (LQ4, Gen III) instead of vehicle information, many sites said they would fit. But as mentioned above, this wasn't a one-for-one replacement. Gaskets and longer bolts were required. When looking for aftermarket spools for a GM product, be sure to check the shackles and part numbers. There are at least two different types of OEM mounts for LS and LQ series motors. Strictly searching for vehicle information can and will be frustrating. Study the characteristics of your engine and assume. But don't be surprised if you have to make small changes yourself.