Both... both are important to me...
And they already show the slip on in-stock on their website...
and show the dyno here for the ZX6R for the slip on...
http://www.twobrothersracing.com/Cust_Service/Dyno_Charts/Kaw_ZX-636R_SO_Dyno.pdf
Here's the page that shows the part number for the 636 and ZX6RR...
http://www.twobrothersracing.com/Exhaust/Kawasaki/ZX-636R.shtm
"Keep yer feet on the pegs and your right hand cranked."
And they already show the slip on in-stock on their website...

and show the dyno here for the ZX6R for the slip on...
http://www.twobrothersracing.com/Cust_Service/Dyno_Charts/Kaw_ZX-636R_SO_Dyno.pdf
Here's the page that shows the part number for the 636 and ZX6RR...
http://www.twobrothersracing.com/Exhaust/Kawasaki/ZX-636R.shtm
