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Regardless of the degree of modification, there are some basic principles that a vehicle must comply with in order to be licensed. One of the more important conditions is the size and weight of the vehicle. In addition, there are some regulations concerning details, such as according to [(Japan) Road Traffic Law] Article 55 Item 2, any modification shall not obstruct the driver's vision and steering wheel operation, nor shall it interfere with the rearview mirror and exterior lighting system normal efficacy. When it comes to some more careful levels, there are corresponding principles. For example, when the camshaft is replaced, the engine will never be allowed to exceed the exhaust gas standard. Non-declarable modification The Japanese law lists more than 80 non-declarable modification parts, which are also collectively referred to as [designated parts]. They are roughly divided into two categories, accessories and parts related to drivability, and each category is subdivided into several groups (see Exhibit 2 for details). If the vehicle is simply refitted with [designated parts], does the refit violate the above-mentioned general principles (for example, the weight does not change significantly, and does not hinder the driving or endanger the driving performance of the vehicle) and the [security standard], the owner does not need to change the registration of the vehicle material. In order to prevent consumers from buying substandard parts, the [designated parts] sold in Japan must pass relevant tests before they are released to prove that the products meet the [security standards]. In this way, buyers only need to be sure that the product has a qualified label, and then they can buy with peace of mind, and they are not afraid of breaking the modification laws by changing the clothes.