Reviewed By Shane M (O FALLON, MO) —4/23/2015 8:11 AM
It took me about 75 minutes to install, so the estimate of 90 is very reasonable. I had read several reviews indicating the instructions were not good, but I had no real issues with them, and loved the pictures. It was a small pain to go back and forth between the pictures and the exploded diagram to see exactly which screws to use for each step, but not a big deal. The performance gain is noticeable, better throttle response, more power, and as others stated a very cool sound.