I could be wrong but I was under the impression that only the later had the deresticted tune, more blacked out bits, stripes. All other model years and I think also the early 13's can be easily derestricted with TuneBoy (not freeware), TuneECU (freeware) or a GiPre (which does not change any thing but if set correctly fools the ECU in to thinking it is in a higher 4 gear) or as mentioned apparently the early 13 can be retuned with later map by dealer. Again I am not sure as to whether you can use a PCV on the later 13 model but on earlier model it is great for giving better fuelling and if you do not have access to someone with a dyno you can add the AutoTune to it and run a AFR map available to down load or I can supply you with the one I created which has a lot of happy users here, it must be noted that if you go down the PCV + AT route you will need to download a suitable TuneECU tune to correct the restriction in the ignition tables and secondaries not mention a few other setting that can be changed
If I have missed something I am sure there will be other to fill the gaps
Cheers
Hans