Sounds like they are serious, I am sure the chassis shaker isn't cheap. Although, GM probably has one in house for the Caddy team.

SCCA Pro Racing SPEED World Challenge




Kershaw, S.C. (Feb. 20, 2007) - Dane Moxlow and Star Mazda Driver Gerardo Bonilla recently took two days to sort out the twin Pontiac GTO"s for the 2007 SPEED World Challenge GT season at Carolina Motorsports Park with a trip to the Ohlins Shaker in between.

SCCA Pro Racing SPEED World Challenge