From Jayski.com:

Busch's Car Fails Post Race Inspection: UPDATE: #5-Kyle Busch's race-winning car in the Yellow Transportation 300 failed postrace inspection at Kansas Speedway, NASCAR spokesman Ramsey Poston said Saturday night. Although NASCAR originally indicated the Hendrick Motorsports car passed but the intake manifold was being taken back to its Research and Development Center for further evaluation, NASCAR later determined that the intake manifold did indeed fail for not meeting NASCAR specifications. NASCAR still will confiscate the manifold for further evaluation. Any penalties will be announced next week.(SceneDaily.com)(9-29-2007) UPDATE: Hendrick Motorsports has used the same or a similar intake manifolds in other Busch Series events - and they have been inspected and passed - compared to the one that failed inspection following Kyle Busch's win in the Yellow Transportation 300 on Saturday, HMS Vice President Doug Duchardt said. Duchardt said the issue is internal modifications - a "fluff and buff" of the manifold. He said that an intake manifold that should have been a twin of the one used Saturday at Kansas Speedway had been inspected for two days at the NASCAR Research and Development Center earlier in the week as NASCAR did research to tweak the manifold rules for next season.(SceneDaily.com)(9-30-2007)