A 1.7 turbocharged Hill climb special with a gass turbine pumping inn air to reduce turbolag.
I wonder how that is done. Maybe it is injected directly into the exhaust manifold runners like the anti lag response system used on WRC and Rally Cross cars. It also would need some kind of bleeder valve on the intake side as it would produce massive boost just at idle.
The other car is a space frame racer with a x-track drivetrain and an 700hp Ford RS200 EVO Cosworth YBx eninge.  Very nice sounding cars.

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http://www.youtube.com/watch?v=ee9H93uvYRo&feature=related