Theres an easy way to tell.
Making a car go fast: Just fine
Making a car look good: Just fine
Making a car 'look fast': Rice
Loser is exactly right. Wings that dont do dick, stickers for parts they dont have, mufflers that actually hurt performance, wheels heavy enough to strain the back of an Olympic lifter, cut springs that 'look low' instead of allow for a lower center of gravity and improved skidpad performance, useless items like 'seatbelt covers' that accomplish zero, 'fake' blow off valves, intakes actually designed to create noise instead of power, body kits stuck on with duct tape, and tail lights that remind me of old toy robot eyes.
Dowding. The actual cars used in the movies were shells. All body, all paint, stock internals for the most part.
In real life, youll find much of the same.
Japanese cars that are tuned for performance are not rice. Rice is the guy at the show that wont open the hood of his Honda Turbo Type RS Supercharged NOS X Type ///M AMG Madphathellafastyo Civic because it says 1.6L SOHC.
If you can get him to open the hood to see whats under the 6 inch hood scoop youre next step is to avoid laughing when he tells you that his mods are 'steath' and 'underneath the engine.'
All show, no go.