ROFL.
Downforce bro. It helps keep the rear down on braking hard. [emoji41]
If you want to keep OEM then just coat your wheels with ceramic. That should make for easy cleaning.
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I don't think slotted/drilled rotors actually add any extra bite. They are soley used for shedding heat which helps on the track. If they do add bite it's probably negligible.
Pads are what determine the bulk of your bite or lack thereof. My car has centric slotted rotors and OEM BMW pads. I've driven my moms car (2010 128i) and she has ceramic pads with stock blank rotors. Braking is totally fine in her car, but I find myself having to press the brake pedal a moderate amount harder than my car if I need to stop quickly.
If your pads and rotors have the ability to lock your wheels, then you cant physically slow down any faster. Things like tire compound and weight start to take effect.
I put the Zimmerman rotors on my 323i years ago and wasn’t real happy with them. They seamed to rust on the hub and I did have a shimmy when braking. Not sure if that was from the brakes or the suspension. Traded it for my ZHP before finding out.
On the pads, I’m currently running Hawk Performance’s High Performance Street 5.0. http://www.hawkperformance.com/perfo...et/pads/hps-50, that give me better stopping power than stock with low dust. On the rotors, I’m running Brembo solids. They have a zinc coating the doesn’t rust. Even after a year or two they still look new. Both are available from tirerack.
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I've read good things about Brembo; people mostly prefer it over Zimmerman. The Hawks I can buy from FCP for ~$170, but the Brembo solids are sold only for the front :(. Maybe I should contact FCP and see if they just haven't updated their catalogue to show Brembo rears under 2005 330ci search.
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I am also a big FCP Euro fan. My indy repair guy will let me buy the rotors and pads from FCP and install them. Very happy about that. I like the idea of never paying for those items again.