helps in cooling the hot rotor. i'd say slotted are better, because drilled holes weaken the rotor. they look cool, but unless you can afford to change the rotors as often as professional racecars do, they're probably not a good idea for the street. Porsche has the holes cast into the rotor during manufacture making them stronger, but they are pricey $$$$.
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Alan
1987 928 S4 (Black) SOLD!
1997 SVX LSi (Ebony) SOLD!
2005 Legacy GT (Silver) [Cobb Stg 2+] SOLD!
1987 928 S4 (Black) SOLD!
2005 Forester XT Premium (Crystal Gray Metallic) SOLD!
2008 Lancer Evolution X MR (Apex Silver) [Cobb Stg 1+]
2015 Outlander Sport 2.4GT AWD (Mercury Gray)
2013 G37xS (Obsidian Black)
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