No transformation, no Harley. As we all know, Harley's soul is transformation. Rebuilding the exhaust pipe is a step to create Harley sound waves or appearance. Therefore, in the process of choosing the exhaust pipe, the first thing to consider is the improvement of sound, appearance or performance.

First of all, we should understand a serious data: ExhaustGasVelocity, just like literally, which is the value of gas passing through the exhaust system, corresponding to the original Harley engine, with a value of 300fpm (feet per second), and this ideal value is the exhaust pipe set to 1-3/4 inches, so the standard pipe diameter of the head section is 1-3/4 inches. Generally speaking, the larger the pipe diameter,

Classification of common Harley exhaust pipe

ShortDragPipes。

ShortDragPipe is a violent and changeable modification option, and V&HBigRadius2-2 is a masterpiece. The short exhaust stroke is often accompanied by large sound pressure and heat energy feedback, which makes DragPipe achieve better horsepower efficiency and sound wave at high speed. But the neat shape and lines make ShortDragPipe popular for a long time!

LargeDiameterOpenPipes。

Large-diameter pipes have long stroke and large exhaust diameter, and the exhaust sound waves are low, but the large-diameter pipes with strong appearance limit the exhaust efficiency. Therefore, specially designed noise-canceling plugs or gaskets are often added in the tailpipes to adjust different sound waves and horsepower effects.

LongStraightPipe。

Long straight-through pipes without silencers can cause loud bangs, but their horsepower is limited. Therefore, when developing straight-through pipes, it is recommended to adopt the setting of 1, 3/4 inches at the head section and 2, 1/2 inches at the tail section to avoid such troubles.

2into1。

The design of the 2-in-1 pipe is biased towards the setting of low speed, which can effectively reduce the back pressure and improve the emission efficiency of the factory. It not only has substantial horsepower improvement effect, but also has attractive low sound waves. The 2-1 pipe is the choice of multi-performance players.

TrueDual。

TrueDual is the basic style of the early station wagon system, that is, walking while walking. In addition to the travel series, it is also appropriate to take the retro-style soft tail. For example, fat boy is very suitable to use this exhaust pipe to highlight the old flavor and domineering! It is worth noting that TrueDual with crossed heads can usually provide better horsepower boost, and at the same time, it can also reduce the shelling problem during deceleration.

Slip-OnMufflers。

Straight tail section is a common modification method, and the original Wuthering Eagle and VH tail section kit are very popular among domestic players. When the head is still, it is more economical and gentle to increase sound and horsepower.

Generally speaking, Slip-On is an economical and effective way, and Longerpipes and 2-1 are good medicines to increase horsepower. Drag and LargeOpen have become manual cars and large engine cars due to explosive sound waves and short travel.