Coffman's Honda CBR 600 F4I (2001-06) Shorty Exhaust

Preface - I am mechanically challenged despite working on my own vehicles for years. I recognize that if 90% of internet mechanics say a job will take an hour, I need to plan on 3-4 hours. This install was no exception.

Most feedback indicated that it would take between 5-30 minutes. It took me about 90. The hole for the O2 sensor was just far enough away that it puts a lot of tension on the wires. Rotating the pipe to relieve some of the tension puts it right against the swingarm. I went with wire tension (a forum search showed that a lot of folks pull the O2 sensor and plug in a resistor, so that is an option). My drill died before fully getting the hole drilled but I was able to hammer an awl through the rest of the way and it worked for the rivet just fine.

Went for a ride and checked the clamp afterwards. It was still on nice and tight. I would imagine you could get away without doing the rivet, but I wouldn't want to chance losing it for want of something so tiny.

As for the sound, it is freaking awesome! It is a loud rumble at, and just off idle, but not obnoxious. Cracking the throttle unleashes the screams of joy, from me and the bike. Of course it's all relative but my friends were complimentary and my wife and kids didn't complain, so I'm happy with it!

I got my exhaust, the installation instructions were straight forward and installation took me just about an hour. The sound is great right out of the box and it has options to make it sound even better even though it's great as is, it looks great also!

Gave it 4 stars. pretty solid build and was easy and straight forward, liked how there were 3 ways to secure to exhaust on. Only thing I didn’t like was the there was a built in baffle after taking out the first. Other than that sounds great.

Sounds great

AMAZING SOUND. Had it installed for 2 weeks no issues. With full baffles in it is still pretty loud but not enough to warrant earplugs. I've found that between 7-12rpm it has a very bad bogging issue. Feels and sounds like it's hitting limiter but your able to power though it. I heard that it just needs time for the ECM to correct itself. Very tight fit but very clean look. And free stickers!