Porterfield R4-S
Congrats on the M5. A modification you may want to consider is changing the brake pads. I have owned my M5 (F90) for two years and I finally got tired of the excessive brake dust and squealing of the brakes when coming to a stop.
Reading the recommendation of other forum members I went with the Porterfield R4-S brakes for the front and rear. I could not be happier. The brake dust has been reduced and no more squealing brake pads. I installed them back in December of 2019 and wish I would have done it sooner.
Last edited by Egrunt; 08-01-2020 at 01:33 PM..
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