I've just recently started wondering about modifying my cbr to make it blow my two buddies 600 ninjas out of the water. I was going to start with a slip on exhaust but I want a great sound and something that will give me more power. Any ideas??

 

Well i haven't done any modes on my bike,so may be some one else can help you out with this.

 

Try installing the bigger one with high power. Naturally you get great sound especially with Yamaha make.