I went out lapping earlier this week with my boss and his 2010 GT3 RS at our local track.
Calabogie Motorsports Park
He was lapping 15 seconds on average faster per lap than I was!! Even if I ran with a big power adder and slicks it would be tough to gain that much time. I'd almost have to strip my car down and turn it into a track car only as opposed to a daily driver.