Harm of installing exhaust valve

Basically no harm. Because the opening and closing of this valve does not match the characteristics of the engine, it is universal, and there will be power lag from the closing stage to the opening stage, unless it is a variable valve that matches the speed and valve technology, the best effect can be obtained. At present, the variable valve popular on Taobao only takes the speed signal and throttle signal as the judgment standard. In daily use, the valve is closed, and the back pressure and exhaust flow are almost the same as those of the original car, which will not damage the low torque.