318is exhaust - oem vs supersprint

[cheesebox]

Can anyone comment on how the oem 318is exhaust (centre and rear) compares to the supersprint?

I'm interested in comparisons in:

- Performance
- Sound
- Looks
- Durability (I think the oem mid section has s/s pipe, supersprint is ally coated steel)

I need to replace the whole lot soonish to get it through the MOT in September. Supersprint is looking like the cheaper option by a couple of hundred punds...