AC Schnitzer has an interesting alternative to the BMW M5. Called the ACS5 Sport S, it is a 550i which has had its 4.4-liter twin-turbo V8 tweaked to produce 540 horsepower, just 15hp under the M5. It reaches 62mph from 0 in just 4.5 seconds and has a top speed just under 200mph. Of course, the only way such a thing would be worth doing would be if it cost less than an M5, but the price has yet to be released. The ACS5 Sport S will be released at Geneva, full details to come.