Exhaust System 325i E90

Hi All, maybe a bit of a chalk and cheese question but need some advice nevertheless.

Road Master exhaust in Hillcrest gave me a quote :
50mm with 2 silencer boxes. Dual all the way.
409 exhaust grade stainless R3800 + Branches R2500 fitted = R6300

Then the question, what about the M performance box only.

Which would give me the better sportier tone?