2. "lengthen" the car according to the user's requirements. Of course, as long as the traffic laws allow, how long is your own business; The method of extension is to insert the steel pipe into the main beam, reinforce it and weld it firmly, then make up the protruding car body and floor with steel plate, and also extend the transmission shaft. 3, welding, we can also call it "assembly". It is the most critical to make the overall performance of the vehicle reach the initial state. At present, I haven't heard that the performance of modified cars is not as good as before. 4, "splicing", similar to the interior and exterior decoration of the room, of course, elegant and luxurious. According to the owner's requirements, TV sets, video recorders, stereos and other electrical appliances can be moved to the car; You can also move office equipment such as computers and fax machines to the car. In the United States, there are manufacturers specializing in the production of this kind of car, called limousine companies, such as new york limousine company (NewYorkCustomCoach) and Crystal limousine company (KrystalKoachInc ), are world-famous, and most of the ultra-luxury luxury cars in the world are released from here. Luxury car companies mainly engage in refitting extended cars. Through their skillful hands, ordinary vehicles have become extraordinary luxury cars that can meet big heads of state and political celebrities. America can be called the luxury car kingdom. There are more than a dozen luxury car manufacturers in the United States. These manufacturers do not have large-scale modern assembly line production, but rely on small professional processing factories to complete it. In this way, a good car really divides into two parts, and on this basis, it is arbitrarily lengthened, which has become the patent of luxury cars, and only the United States is unique. There are many brands of modified cars. Cadillac and Lincoln naturally have them. Noble Rolls Royce, Mercedes Benz and unknown Japanese cars are also among the modified cars, not to mention Ferrari and Porsche will only appear in the form of coupes. The "Beetle", which is famous for its small size, has been lengthened and enlarged, which is amazing. The car can be lengthened as long as you like! I'm afraid this can become the advertising language of luxury car companies! Although the scale of this kind of factory is not commendable, the process equipment of the factory and the production skills of employees are rarely compared. It also represents the level of automobile modification in the world today. The production capacity is about 3000 units per year. The cockpit of the car is simply a luxurious presidential suite, and it is also an excellent place to display the talent of refitting. The most basic design is to have a wine cabinet and refrigerator. The back seat can be designed as a double-row seat or an L-shape, just like a sofa bed. Of course, like the Pope's Mercedes-Benz 600, it is not bad to put a big sofa in the middle of the back row, which is very exclusive. There is also a relatively easy way to lengthen the B-pillar, such as China's Hongqi (Audi) CA7226L, and the B-pillar is widened by 233mm；; German BMWL7, etc. The extension of this car is usually completed in the original factory. With the maturity of technology, the modified models are not limited to modern cars, and the modified antique cars such as Excalibur are even more dazzling. Beijing almost includes classic luxury cars from all over the world. Some famous American politicians, such as Mr. Kissinger, came to Beijing to name "big names" or "Changlin". These luxury cars have also become the darling of young couples in China.