What are the pseudoscience products that charge IQ tax?

Nowadays, more and more people buy cars, and all kinds of automobile supplies are mushrooming. Some things are really useful, but some car supplies are really "IQ tax". Like down there. Electronic Throttle If someone says that his product is amazing, you only need to install it on the accelerator pedal to make the car of 1.6 drive 2.0, will you be moved? If so, you have been cheated. This thing is the electronic throttle, claiming that there is no need to change the engine. As long as this thing is installed on the accelerator pedal, it can immediately improve the power of the vehicle. Someone bought it, and the power was really improved after installation. Is this thing really so magical? Of course not. Why can the vehicle power be improved? Let's talk about the throttle first. This thing in the picture above should be familiar to everyone. This is called throttling, and throttling is throttling. It controls the intake of the gasoline engine. We all know that stepping on the accelerator will increase the power of the engine, and stepping on the accelerator will lead to the maximum output power of the engine. When we step on the accelerator, we control the throttle opening. The larger the throttle opening, the larger the intake passage of the engine, the more air enters the cylinder, and the greater the fuel injection, so the greater the output power of the engine. How does the accelerator pedal control the accelerator opening? The earliest accelerator is cable-pulling, and the accelerator pedal directly drives the accelerator through a steel wire. However, this kind of throttle is almost not used by manufacturers now, and electronic throttle is popular now. The above picture is a schematic diagram of the working principle of the electronic throttle. The man on the right is stepping on the gas. There is a signal sensor in the accelerator pedal, and the action of stepping on the accelerator is transmitted to the middle ECM in the form of electrical signal. ECM means engine control module, which can be understood as "ECU" and "engine control computer". Then ECM calculates your power demand through the driver's action of stepping on the accelerator, and then sends a signal to control the leftmost accelerator to open the corresponding angle to change the engine output power. Electronic accelerator can improve power by changing the signal of accelerator pedal. For example, under normal circumstances, step on 10% throttle, step on 10% throttle, step on 20% throttle and 20% throttle. When installing the electronic accelerator, it will intercept the signal of your accelerator pedal first, and then increase the signal and send it to ECM. For example, if you step on the accelerator 10% and the signal it intercepts is 20%, then ECM will control the accelerator to open 20%, and the power will naturally increase. Therefore, the electronic throttle does not improve the engine power in essence, it just helps you "step on the throttle a little more". Appropriate "IQ tax". In fact, there are still many kinds of automobile supplies. You searched for "saving fuel and improving power" in the search results, except that some fuel detergents may have certain effects, other "physical plug-ins" are deceptive. @