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!

Absolutely awesome shorty, it’s loud but not TOO loud & makes the bike sound much more aggressive. It also looks incredibly clean on the bike if you’re not a fan of the long original exhausts.

Came with a nice little guide on installation & some stickers, but it’s essentially plug & play so not difficult for a quick job on the drive, took about 20 minutes from removing the old to torquing up the new

Great sound great product for F4i. Easy installation

I desperately wanted to get rid of the big Jardine can I had on my bike and the rear pegs for a cleaner look. Not only visual, but I really wanted to have a significant presence on this thing while riding.

The exhaust note that comes with this setup (baffle out) is absolutely unreal. It is so crazy to me how gnarly this bike sounds now. You can literally hear it a mile away.

I'd highly recommend investing in some nice earplugs that allow you to still enjoy the beautiful sound of this exhaust but doesn't vibrate the drums out of your ears. Extremely happy with my decision of getting Coffman over all of the other types of exhaust out there. I'd recommend everyone getting this but we can't have every F4i sounding this good!

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