That largely depends on what/who/how your car was previously tuned.
There are a range of reasons to bring your already tuned RS to Race Spec Tuning.
If you’re not sure if you need a retune why not just book a power run on the dyno and compare your results to see if there’s more in the car with a better tune.
Good news is in most cases we can retune any Renault Sport, but there are some proviso Get in touch to discuss your options