Hi Ricardo,
If by "True IP client" you mean that server needs to see the actually client IP even though ACE is natting the source then yes ACE does that.
policy-map type loadbalance first-match L4_HTTP
class class-default
serverfarm sf1
insert-http x-forwarded-for header-value "%is"
%is represents source IP. More details and example can be found at the below link:
http://www.cisco.com/c/en/us/td/docs/interfaces_modules/services_modules/ace/vA5_1_0/configuration/slb/guide/slbgd/classlb.html
Regards,
Kanwal