Do you track the car?
If not, OEM is probably the best compromise.
Diminishing returns with pads, like most parts, so a set of Pagid RS (whatever compound)if they're made in R32 size, will be a pricey proposition.
Note that technically if you fit a non e90 pad (DS2500 for instance) your pads are not legal for road use. I do find this a bit funny, as if you're running non-standard brakes (calipers and discs) on a car, you've already changed the brakes from the OEM performance so what difference does a higher or lower friction pad make??
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