Because the mounting points are different, not to mention the bike geometry.

 

i got all my answers on this webpage. Now inowwhy no cut frame sliders were manufactured for cbr1000rr '08.Its all got to do with R&Dand making the bestconsideration for placement of slider in the name of safety.
check it out guys.
http://www.motovationusa.com/primer.html

 

This is what happened to my 05 Repsol with No cuts. They are LP carbons...if anybody is interested. Bike sustained about $2-3K in damage...from a 50mph lowside in gravel.

After






Decide for yourself.

 

And that my friend is why I would rather cut my fairing and attach the frame slider directly to the frame like they are suppose to be!!!!!

 

My experience favors cut sliders.

The pics show the damage following a rear tire spin out on corner exit, followed by violent headshake and a bike low side at ~90mph. The side cowl was virtually un-damaged (a few dings behind the clip-on). The seat cowl was ground down a little. Half of the R&G slider was ground down, along with the Vortex rear set peg/shifter and swing arm bobbin. Bike slid on asphalt for well over 100'.

Several riders who saw this were very impressed...

This thread has a similar discussion (cut vs no-cut), with pics showing an 08 that experienced a 20mph low side. The no-cut slider damaged the frame, totaling the bike.
http://www.1000rr.net/forums/showthread.php?t=59344

I think the problem is leverage. No cut sliders sit at the end of a mounting bar and upon hitting the ground, they create leveraged stress at the mounting point.

On the 08, the mount point is very strong and in an excellent position for protection (purposely designed by Honda for this reason, IMHO).