A new chip such as a Turbo Tweak chip would improve the overall driveability and performance of the car, oh and improve the idle also. The stock chip in the GN can get you in trouble with your headgaskets if you were to hammer on it with pump gas as there is too muchtiming in the stock chip for todays pump gas.
No more cold start hesitation, rich idle in open loop, and like mentioned above overall driveability of the car will be dramatic!
Smoother idle, no more tip in stumble, better spool, etc etc