Definitely have the diffuser black... There are many pictures everywhere throughout this forum. You can even look @ my recent posts as I've posted one with my performance bumper
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2007 E93 328i | Space Gray Coral Red | M-Tech Front Bumper w/ Carbon Fiber Splitters | BMW Performance Rear Bumper | BMW Performance Exhaust w/ Secondary Cat Delete | Injen Intake | HID Angel Eyes | M3 Trunk Lip Spoiler
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