In case you haven't seen the new video yet, check out the install vid I made for the new slip-on I put on my 2009 Yamaha R6...
The Competition Werkes slip-on fits like factory, sounds great and even dropped some weight. Check out the vid below for the full details.
http://www.superstreetbike.com/videos/6216438/competition_werkes_gp_slip_on_exhaust_for_our_2009_yamaha_r6/index.html
For more info on the exhaust check out: http://www.competitionwerkes.com/
For more info on the Six, peep http://www.yamaha-motor.com/sport/products/modelhome/6/0/home.aspx