If the condition of your car is in fact not very good then yes I would change. But in regards to Vpsec vs non Vspec I personally don't think theres a HUGE difference.... others will probably tell you differently...
The only major thing is the ATESSA ETS Pro I think instead of the standard atessa but unless you race often i doubt you'll feel the difference on the street. But if you want the Vpsec to have a "Vspec" cos its more rare then go for it.