Hello from France,
the chassis is the same as 2008 and 2007.
You won't will go 1 second faster because you have a 2009 model.
But, for sure, you will go longer (reliability increase with harder plastics, larger belt, larger gear, hard spring gearbox, alu shocks, rear CVD...), and easier on building (radio plate and servo mounts...).
Here's my 09 car:
And the thread
http://www.automodelisme.com/index.p...opic=25415.270
Au revoir.