I put on a FMF IV S/A pipe a few weeks ago and had to retrain myself on the way I came out of corners, it provided a really nice increase throughout the power band. Then I decided to put in the EKP ( Yamaha P/N 5JG-14916-EP) needle. Man, what a difference. I did my normal acceleration to the first curve and realized I was going way too fast. I was wondering what the hell was doing wrong until I remembered that I had put in the new needle. It took a number of brake slides to learn to roll on the power with a lighter touch. For and $18 mod, I highly recommend it.