dimpled? bogus.. anyone who drills holes into a tempered rotor is a con artist..
and no.. no law saying you cant sell modified parts, just dont expect brembo warranty.
for the 4th gens im not a big fan of AEM.. a bigger rotor using the same caliper sweep = waste of time IMO.
but for the 5th gens (maybe 6th??) they have a 4 piston monoblock setup which is quite nice.