IIRC on the non-ISO boards, FUD=99 just holds pwm @ 80. This may or may not increase rattling. It did for me, but you can try it. The ISO board has a more comprehensive rattle fix system allowing you to dial in a wider range of options.
E90 LCI M3 7-DCT Interlagos Blue/Novillo Silver
[MS Pullies|K&N drop-in|Test Pipes |Evolve Stage II tune|Evolve Servotronic Map|Evolve M3 GTS-DCT file]