I emailed this company (GMP Performance)and Matt Legg responded the same day. He was very friendly and knowledgeable about their products. When I asked a technical question about the AC Schnitzer Rear Wing, he contacted the manufacturer and emailed me the next day with the answer. He even emailed some additional photos of the wing on the 645ci. I've haven't purchased anything from this company yet, but they seem to have great customer service.
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