How could anyone likes cheating? To achieve any GOLD in Licences is good for your practice.
Congratulations, but think about your next steps with Nismo 400R in case of its tuning. It is a good car to win Normal Championship, where cars must not be tuned. I recommend you to leave this interesting car without tuning (especially this parts of it, which cannot be taken back e.g. Weight Reduction, Racing Modification, Port Polishing etc.)