Exhaust

Specialist in parts and accessories for Harley Davidson motorcycles, Holy Death Shop offers all the spare partsfor the exhaust line. Thus, you will find complete lines, double exhaust or double exhaust outlet, exhaust silencer, manifolds, clamps, particulate filters, thermal band, muffler, exhaust tip, cap, exhaust pipe...

Likewise, you will find the best brands of exhausts and mufflers for all Harley Davidson models: Sportster, Softail, Dyna, Big Twin, FLT, Twin Cam, Tourer, Vrod, chopper, café racer, fat bob, bobber, Tuning, custom motorcycle...

Indeed, the exhaust system is the first element that riders change to find the inimitable "potato potato" of the Harley. It is also necessary to change the air filter and have a new cartography.

Finally, Holy Death Shop proposes you all the spare parts of original quality, to pass the technical control :

• Exhaust pipes, rear silencer, particulate filter, tips, expansion pipe
• Frame, housing, cylinder head gaskets, catalytic converter, valves, elbow
• Rims, pipes, shock absorbers, clutch, bolts, silent-bloc, brakes, spark plugs …

The exhaust’s sound for Harley-Davidson

First, exhaust systems make noise as the combustion gases exit. Thus, the different brands are looking for exhaust noises that are closest to reality.

However, the sound level must be put into perspective due to the quality of the microphone, the sound environment, the distance and angle of the latter with the outputs, the compression rate of the files, etc.

It appears in fact, the exhaust allows the gases produced by the combustion of air with gasoline in the combustion chamber to be expelled into the atmosphere.

Besides, this operation takes place during the last cycle of the 4-stroke engine, ie the exhaust. During this time, the piston rises and expels the burnt mixture.

The exhaust line: triple role and composition

First of all, the stainless steel exhaust of a road vehicle must make it possible to expel combustion gases. Likewise, it makes it possible to limit the noise due to the evacuation of gases. Also, it reduces polluting emissions.

However, the elimination of toxic molecules is done by catalysis, since 2003 and the Euro 2 standard. Thus, an exhaust consists of at least 3 parts:

• Manifold accompanies the exhaust gases
• Silencer reduces noise and limits polluting emissions
• The catalyst works in conjunction with electronic injection

Exhaust manifolds

First, the operation of the engine requires evacuating the gas. Thus, the exhaust manifold, other than on a single-cylinder, allows the various stainless steel or aluminum lines to be grouped towards one or more exhaust outlets.

Moreover, the twin-cylinder has a 1-in-1 or a 2-in-1 manifold. Also, a "2-in-1" manifold optimizes the gas outlet speed. Therefore, the manifold improves engine efficiency by taking advantage of the effects of pressure and backpressure.

Finally, multi-cylinders require a more compact manifold with a more linear sound.

The catalyst

First, the catalysts represent a small factory that transforms toxic micro-particles (Cox and NOx) into harmless chemicals. Thus, the motorcycle catalyst is an integral part of the silencer (s). Besides, it is placed upstream of the baffle.

The silent

First, the stainless steel or titanium silencer reduces the noise of the burnt gases which loosen. Also, it dampens the sound inherent in gas speed by:

• Chamber 
• Reflection
• Discs: method chosen by the Supertrapp brand

So, the complete motorcycle exhaust line regulates the flow of gases exiting the engine, like one wave per cycle.

Moreover, the chamber silencer forms a baffle partially obstructing the pipe and reducing the diameter of the exhaust outlet.

Besides, the exhaust gases travel through pipes which slow them down, reducing their speed and noise pollution.

Finally, this acoustic reducer is mostly surrounded by rock wool, an excellent sound insulator.