I just got done installing my Airtech+6 tail section and Tiger Racings extended undertail. here's a link: https://www.hayabusa.org/forum/busa-mods/177254-how-install-6-airtech-tail-section.html . The only hard part was figuring where to cut the end but I got it down and anyone needing a copy of the template I made can PM me. The undertail section bolted up perfectly I also installed the NEW 24V automatic starting system he is selling . Its very easy to install and if you have a bigbore bike you WILL want this, What a difference!