Will this work?

[s8n]

eBay Motors: New OEM BMW Auxiliary Audio Input 3, 5, X3, X5 Series (item 130182753301 end time Dec-14-07 19:29:17 PST)

With E46 325 Ti ?

[will_pop]

HI mate.

depends on what year your Ti is, mainly due the the difference in the radio module

[razza]

What year model is your car? Does it have indash cd player? Does it have a stacker? Basically the best way to check is pull out your head unit and check if their is a spare auxiliary connector?
If it looks like the pic below you are set. Those to smaller connectors below the large main connector are your aux inputs. Usually one is for the stacker and the other is for the ipod/aux cable.

[s8n]

Its the last of the 325 Ti, 03/04 model apparently...