Pretty sure that getting another car is not gonna make his GTS faster.. anyways you might wanna consider a ECU upgrade. Other than that Headers and Exaust are a must. If you really want to max it out I suggest also a Turbo or Supercharger and nitrous. If you get nitrous make sure you get a wet kit and you might wanna consider a direct port setup. Hope this helped congrats on the new car
CelicaHobby.com is an independent Toyota Celica enthusiast website. CelicaHobby.com is not sponsored by or affiliated with Toyota Motor Sales, USA, Inc. in any way. The Toyota and Celica names and logos are trademarks owned by Toyota Motor Sales, USA, Inc.