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!

Hated the exhaust on my bike when I got it, Love it so much now!! Thank you Coffman!!

Love love it.

Replaced factory muffler with this unit so that other drivers might actually hear me near them. I’m confident they can. No notice of power loss or gain just a lot louder with a good tone.

Fix well on cbr 600 f4i 2002