Not worried about him being aggressive I just can't have a male that wants to hump everything I have 135lb american bulldog that does not put up with that he would become a headless pug.
I have mine set up so they call me, the wife then both kids before sending cops. I didn't want the kids setting the alarm off and cops showing up. The last time my son set it off me and my wife got a call at the same time.
I've heard lots of good reports on the m4 here is a video of m4 on '09 zx6r http://www.youtube.com/user/M4Exhaust#p/u/13/twAnylNRGpI sounds pretty good to me
If you don't like the shiny finish you can always get it coated or the m4 comes in flat black finish http://cgi.ebay.com/ebaymotors/M4-EXHAUST-KAWASAKI-ZX6R-ZX-6R-BLACK-GP-SO-2009-/310322591482?pt=Motorcycles_Parts_Accessories&hash=item4840aaf6fa
If this is what your looking at it's going to be loud as hell http://cgi.ebay.com/ebaymotors/Hotbodies-MGP-Exhaust-Kawasaki-ZX6R-ZX6-2009-2010-09-10-/250615027662?pt=Motorcycles_Parts_Accessories&hash=item3a59d1d7ce
You can get m4 slip on for around $300 hell here's a muzzy for $290 http://cgi.ebay.com/ebaymotors/2009-Kawasaki-ZX6R-Muzzys-S-S-M10-Slip-Exhaust-/200617565448?pt=Motorcycles_Parts_Accessories&hash=item2eb5bd1d08
That sucks when I was on it last season they were paving parts and others were still untouched and kind of rough but we were in that area when the hippy fest was going I think they call it "the rainbow fest" or some shit lots of people camping every where had to slow way down good time to avoid that area.