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You wont see any major effect on the drag co-effcient until you are up to speed so no.. Unless your talking about a standing start to speeds in excess of 60mph
I've went the same route as RON above. I noticed that my car is actually more stable at high speeds now (90+)...the car now tracks straight instead of me having to make many minute corrections just to keep it in a straight line. I had the V4 mid-level spoiler fitted previously.