I've got a Fabspeed X-pipe with resonator and secondary cat delete and love it! Many people have commented on the great sound as well.
The SOSI X-pipe has a similar sound - Not too loud but noticeably louder then OEM
'12 Ducati Diavel
'06 E46 M3 (sold) | '97 325is - Dinan (sold)
'02 Z3 3.0 coupe (sold)
Past - '84 Ferrari 308 GTSI | '88 Ferrari 328 GTS | '05 Dodge Viper Copperhead Edition #180/300 | Audi S4