The main change over happened in 2013 so comparing 2013 onwards with 2009
[TABLE="width: 500"]
[TR]
[TD]
2008 - 2012
[/TD]
[TD]
2013 - 2016
[/TD]
[/TR]
[TR]
[TD]Standard Brakes (still very good)
[/TD]
[TD]Brembo Brakes
[/TD]
[/TR]
[TR]
[TD]990's series engine
[/TD]
[TD]991's series engine
[/TD]
[/TR]
[TR]
[TD]0-60mph 4.5 seconds
[/TD]
[TD]0-60mph 4.6 seconds
[/TD]
[/TR]
[TR]
[TD]106bhp @ 8500rpm
[/TD]
[TD]100bhp @ 7500rpm
[/TD]
[/TR]
[TR]
[TD]104.3Nm @ 6250rpm
[/TD]
[TD]108Nm @ 5000rpm
[/TD]
[/TR]
[TR]
[TD]After market kit available to make front shock mounts higher for improved handling
[/TD]
[TD]Front shock mounts higher for improving handling
[/TD]
[/TR]
[TR]
[TD]Standard front shocks
[/TD]
[TD]Improved front shocks
[/TD]
[/TR]
[TR]
[TD]Catalytic converter built into exhaust
[/TD]
[TD]Catalytic converter separate and mounted under engine (some suggestions this increased heat in engine bay)
[/TD]
[/TR]
[TR]
[TD]Flat bars, could not be swapped with other Spyder models
[/TD]
[TD]Slightly raised bars, mounts changed so could be swapped with RT or ST bars.
[/TD]
[/TR]
[/TABLE]
The engine on the pre-2013s was more rev happy and faster but as a result also gets though the gas quicker. Personally I prefer the older engine
I agree with DrewNJ on the choice but that's probably because I have a 2011.