Cisco WAN :: 3560 / 2811 - NATing To Surf Some Of IPs

I am facing problem in my setup which includes cisco 3560 and cisco 2811 router.Actully I am ruuning BGP in 3560 l-3 switch.Some of the customers are connect to 3560 switch via 2811 router,all of those customer having same rate-limit.Some of the customers are directly terminated in 3560 switch where i configure vlans,all vlans has different rate-limitsPROBLEM:I need to do nating to surf some of the ips only for one customer on the 3560 switch.so i m using route-map using acl on switch and doing natting on router.Using route-map i m redirecting traffic to my routers loop back interface, where i m doing natting and send it back to the switch.