The modification of the straight oval exhaust system in Grand Prix can increase the power of the car, with charming sound and cool appearance, and meet the individual needs of modification fans. According to the replacement of exhaust pipe, increase exhaust resistance and enhance engine strength. If you only want charming sound, you only need to change the exhaust pipe to achieve the goal, such as straight individual sound, flat drum mute effect, etc. These modification projects have no influence on the power and fuel consumption of the original vehicle.

1.S back pressure design outside the drum-it can improve the middle and low speed torque (referred to as low torque for short), with fast start, strong climbing and low sound. About 80 decibels won't sacrifice high-speed horsepower. However, there will be a slight resonance sound at high speed, which will obviously improve the horsepower at high speed.

2. Internal back pressure —— The products are specially designed for back pressure according to the characteristics of different models. Under the condition of no loss of horsepower, the straight oval shape of Grand Prix can also improve the torque at medium and low speed, with heavy sound, strong climbing and fast speed increase, and no resonance sound regardless of the speed ratio.

3. Straight row-more suitable for running high speed and track for a long time. The sound is about 95-100 decibels, which is relatively bright. The main purpose is to improve the high-speed horsepower, but the straight oval shape of the general Grand Prix has relatively great damage to the middle and low-speed torque. Some manufacturers can reduce torque damage according to the design of inner wall back pressure and tail bell mouth, while still giving full play to the role of boosting horsepower. When the speed is continuously high, the effect of increasing horsepower is more obvious.

4. Semi-back pressure-improve the low-speed torque. The sound is relatively bright, about 90 decibels.

5. Elliptical flat drum (also known as M drum), a novel elliptical drum body, has multiple back pressure design, and further adjusts the back pressure according to the speed ratio. There is no resonance sound at high speed, and the gas flow rate is slow at low speed of the engine, which is slow according to the speed of the regulating valve. When the engine is at high speed, the gas flow speed is fast, according to the speed of the regulating valve, the vacuum is large, the exhaust gas is much, and the high-speed discharge is smooth. Achieving the effect of increasing torque can also produce the effect of increasing horsepower. (Full-speed power) It is about 85 dB at high speed, and it is an exhaust pipe with obvious display and improved power according to the design concept in China.