There are a few trick bits you could use but would be expensive and prob not notice that much, all engines work better on a cool day, desmotronics are clever but expensive and i think ducati own the rights now, you may see pneumatic valves soon, i think McLaren have done well by reducing weight which is harder than adding power.
Here are a few things could be done.
1st) Water injection can be used to mix cold water to make the fuel air mix denser
2nd) could use charge coolers water/air again to help drop the temp of the incoming air, but the distance from the turbos to the inlet is short so the air wont heat up that much.
3rd) thermal ceramic coatings can reduce under bonnet temp by 33% the cast manifolds,hot side of the turbo and exhaust can be coated making temps cooler turbos to spin up quicker so making more power. I had these on my corrado exhaust manifold as sat on top of the inlet helps with heat soak.
http://www.zircotec.com/page/turbochargers/138
Lotus engineering are doing a lot of clever stuff they have designed a 2 stroke engine with variable compression under different engine loads. http://www.youtube.com/watch?v=fIG9pWldO8U
Here are a few things could be done.
1st) Water injection can be used to mix cold water to make the fuel air mix denser
2nd) could use charge coolers water/air again to help drop the temp of the incoming air, but the distance from the turbos to the inlet is short so the air wont heat up that much.
3rd) thermal ceramic coatings can reduce under bonnet temp by 33% the cast manifolds,hot side of the turbo and exhaust can be coated making temps cooler turbos to spin up quicker so making more power. I had these on my corrado exhaust manifold as sat on top of the inlet helps with heat soak.

http://www.zircotec.com/page/turbochargers/138
Lotus engineering are doing a lot of clever stuff they have designed a 2 stroke engine with variable compression under different engine loads. http://www.youtube.com/watch?v=fIG9pWldO8U