Can Interior Modifications Pass the Annual Inspection?

[DeEleanor]

Interior modifications can pass the annual inspection, but seats cannot be removed, and the vehicle's structure cannot be altered. The structural characteristics registered with the vehicle management office must not be changed without authorization. Modifications that can pass the annual inspection include: 1. Enlarging the throttle to significantly improve air intake flow, though excessive modification may cause engine knocking due to an overly lean air-fuel mixture; 2. Lightweight pistons with a high compression ratio, reducing the load on the engine crankshaft and connecting rods, resulting in quicker engine response and stronger explosive power; 3. Camshafts with optimized angles, increasing valve lift and opening angles to ensure more combustible mixture enters the cylinder and exhaust flows more smoothly; 4. Adjusting the final drive ratio and gear ratios, increasing the final drive ratio and tightening the gear ratios from 1st to 4th gear to enhance the vehicle's acceleration; 5. Upgrading the spark plug wires, replacing the original high-resistance wires (typically around 5,000 ohms) with low-resistance wires to maximize the energy transfer from the ignition coil to the spark plugs, though precautions must be taken to prevent spark jumping and interference.