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Every modification involves a compromise that differs from the compromises settled on by BMW, and if you can live with the compromise you have made that's great. A lowered suspension lowers the center of gravity and helps control air flow under the car, but it also reduces suspension travel and makes scraping the pavement much more likely. It also changes the suspension geometry in any car that doesn't have parallel upper and lower wishbone suspension. For a car that spends its life on the track this may be beneficial in terms of lowering lap times (or not, depending upon how knowledgeable you are). But for a car that lives most of its life on public roads I am reminded of a comment made in Road & Track magazine in the early 1970s when testing the 2002 tii. They mentioned that the BMW was faster and better handling than the majority of the low-slung 2 seat sportscars on the market because you didn't have to slow down to traverse railroad tracks or struggle to maintain grip cornering over rough pavement with the more supple suspension.
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