[App_rpt-users] URI 6dB amp for Kenwood TM271a ?

Has anyone had to use the 12v / 6dB amp of the URI with the modified Kenwood TM-271a radio? I did the 6 pin mini din data mod on the tm271a radio and was under the impression the 6dB amp would be needed. But I seem to be getting the audio from the 9600 baud pin just fine.