Do NOT and i mean do NOT remove the resonator ... resonator are there for a reason and to divide gas flow in a way to balance back pressure and remove drone... if you remove you cats that is not a problem... but removing the resonator will make ur l6 engine rasp and drone a lot... if i were you and since we have same i6 engines.. i would recommend going for the remus axle back muffler with sec cat delete... believe me removing ur resonator will cause u to go crazy and the cool factor will wear off in a month... if i were u and since u have a 535 i would do this:
1-REMUS OR EISENMANN OR RPI axle back with sec cat delete..
2-Injen Intake
3-ECU REMAP... Upsolute is a good austrian company or ESS is the same
4-3D design exterior body kit
5-VMR 710 staggered rims...