Making a double exhaust for a car

11.08.2021

You can often see cars on the street equipped with two exhaust pipes at once, often of an unusual type and size. We are talking not only about powerful cars with rear-wheel drive, where this is justified, but also about ordinary VAZs and other cars in the middle segment. Let's figure out what the point is in making a double exhaust, what are the advantages of this, and whether it is possible to carry out this improvement yourself.

When to install a split exhaust pipe

The main reason for tuning the exhaust system is the desire to increase engine power, while maintaining a balance between performance, wear and fuel consumption. This cannot be done by changing only one part or assembly of the car. More serious intervention needs to be considered. The bifurcated exhaust is an integral part of cars with V-twin engines, increasing their throughput.

However, similar systems are often used in vehicles with standard four-cylinder engines. Installation occurs in exactly the same way using row wiring. And in order not to install two catalysts, a system is used that includes a flame arrester (the catalyst is removed at the physical and software levels). When reworking the exhaust system, first of all, the type of engine and its design features are taken into account, and only then additional parameters, such as pipe bending angles or resonator dimensions.

How to choose?

It’s worth figuring out how to choose the right double exhaust for a VAZ 2114; to do this, you can use the following tips:

It is necessary to take into account the sequence, the greater the weight of the product, the better. That is why the main attention should be paid to the choice of weight and quality of material.
It is also important to evaluate the quality of the seams; they should not be too thin, but they should be even.
The length of the product, as well as the attachment point to the body, needs to be assessed whether it is sufficient.
Evaluate how thoroughly the areas of the product are painted; if the paint chips, it is better to refuse the purchase. This is a sign that the product is susceptible to corrosion and will not last for a long time.

Why do they split the exhaust?

A properly designed dual exhaust pipe will provide the owner with the following benefits:

Increased engine power and torque. The fact is that the level of resistance at the exhaust gas outlet decreases. The exhaust system can be configured as direct-flow or non-direct-flow.
Change in sound of exhaust gases. At the same time, you can adjust the sound as you wish - make it louder, quieter, softer, lower, or make it “growl”. It all depends on the selected system components and how sound will be absorbed in it.
Improved appearance. From the side of the bumper, the car will look aesthetically pleasing due to its symmetry. The look is reminiscent of a racing car and can transform even an old Russian model or foreign car for the better. The owner can choose the appearance of the pipes in his own way.

To summarize, a dual exhaust pipe, provided the right design solutions are used, can improve an ordinary car both visually and in performance. With all this, the alteration is considered one of the simplest; the process does not require intervention in other components and mechanisms of the car.

Ways to solve the problem

Motorists and service station specialists practice several ways to solve a problem, which differ in labor costs and final results.

So, you need a SPb bifurcated exhaust. The first method is simple - weld an additional outlet pipe to the default one installed under the rear beam, and then bring it out in the opposite direction. In fact, you will get two branches diverging in different directions. The downside is that the system will only work at idle. In other cases, exhaust gases will be discharged from one pipe - the one that was originally used. Not all motorists like this result, although it is the most affordable.

An advanced option is to install special linings. Once you find out how much it costs to split an exhaust, you'll love it. The covers change the appearance of the structure, and in terms of functionality they are somewhat reminiscent of wheel covers.

Such an intervention can hardly be called a full-fledged tuning, but it has its advantages (including the material factor). During a technical inspection of a vehicle, you don’t have to worry about the specialists having questions; they won’t consider the second pipe or lining a violation.

Another way to solve the problem is to weld an additional pipe to the main resonator. Let's look at it in more detail.

Sequencing

It is necessary to remove the muffler and find the best option for intervening in its design, in which the escaping gases will be distributed evenly between the two outlets at idle and high engine speeds. Direct branching will occur after the resonator.

To get a bifurcated exhaust, take a workpiece of suitable size, check its integrity and traces of rust - in our case it is unacceptable. Measure the length that matches the exhaust system parameters. This way you can accurately position the pipe on the spar. Attach the structure to the bottom directly to the spar, having previously drilled two technological holes. Use metal brackets or similar as fasteners. Finish the welding job, and then check the operation of the exhaust system with the engine running. Remember that the resulting structure must be sealed and securely fastened to the bottom.

In some models, the outlet structure is located close to the fuel structure. Be careful not to allow the fuel tank to overheat when hot exhaust gases pass through the additional pipe. To do this, use reliable thermal insulation, which will be offered to you in specialized stores or recommended on thematic forums (it’s good to watch a video of the process).

Types of bifurcated exhausts

The specific features of the device depend on what type it belongs to. The following main categories can be distinguished:

H-shape. Two autonomous pipelines, which are connected by a jumper of the same cross-section and come from the exhaust manifolds. This option provides a sound “like a Harley”, which is why it is popular. The jumper distributes pressure waves well in both circuits.
Y-shape. At first the pipelines are separated, but in the center they are united. Such a system will operate quite quietly, but the engine power will also be reduced.
X-shape. The exhaust gas flows intersect in the center. At the same time, they go very quickly, providing an even sound and increased power of the machine.
Double. Complete absence of intersections of flows from the right and left cylinders. The option is optimal for V-shaped engines, as it allows you to freely position other elements of the car.

We must not forget that the purpose of the exhaust system is primarily to reduce the sound level, and not to increase it. Therefore, a car with a 4-cylinder inline engine will never sound like a V-8 does. However, you can adjust the sound timbre in one direction or another.

Installation options

There are several ways to install two pipes on a car:

Replace the standard resonator with a T-shaped sports version. It is one of the simplest and most reliable methods.
A complex system of transitions in the muffler ensures a uniform exit of exhaust gases from both pipes, regardless of engine speed. But at the same time, the throughput of the route practically does not increase.

Separate the pipes under the bottom of the car by welding a tee instead of the middle resonator. This will significantly increase the efficiency of exhaust gas removal, and equal pipe lengths will ensure uniform smoke output. In this case, both standard units and sports versions can be used as mufflers.

Weld the elbow to the pipe directly in front of the muffler. This method is effective, but not effective. At idle speed, smoke will come out of the pipes evenly, but when they increase, it will follow the path of least resistance. And if the piping is not equipped with a muffler, the volume of the engine will increase significantly and resonating vibrations will occur in the cabin.

Lay personal routes to the exhaust manifold. This method is the most complex and time-consuming, but also the most effective. Gases from each group of cylinders will be diverted into a personal route, which will double the efficiency of the gas outlet. It is recommended to use this option if there is a significant change in the engine: installing a turbine, changing the cylinder head configuration, installing nitrous oxide.

If the goal is only to ensure a spectacular appearance of the car, then the best and least expensive option would be to install a special muffler. There are many of them, and they differ in size, level of sound absorption, and configuration.

Making your own dual exhaust

Without the appropriate experience and special equipment, it is not recommended to make such radical changes to the design of the car - despite the apparent simplicity, there are a lot of pitfalls and nuances known only to specialists. For information, we will talk about the general principles of how the process is carried out.

The simplest method, which is often used: bifurcation at the very end of the exhaust tract. You can remove either two pipes without a muffler, or take one pipe to the side from the muffler. We must admit that this is not the most effective option, and it doesn’t look the best. It will not change the sound in any way, and may also lead to a decrease in power and increased fuel consumption. But if you install a well-executed dual exhaust system, it will really make positive changes in the performance of the vehicle.

Experienced motorists, especially owners of VAZ (Priors or other models), distinguish two main types of design:

With different angular indicators.
With equal angular indicators.

When installing a homemade structure, you need to pay attention to the deviation of the new pipes from the location of the old holders - difficulties often arise with this. However, new holders can also be made, then the problem disappears. It is important to wrap the homemade exhaust with asbestos cord: it provides high-quality thermal insulation and helps to avoid fire when heated by a fuel system located nearby.

By contacting the Muffler Master service with any questions related to exhaust systems, you will receive a competent answer, fast and high-quality service. We have been working in this area for many years and have achieved perfection in it.

Prices for parts and services

The cost of manufacturing an exhaust system is from 18,000 rubles
Split exhaust system from 6,000 rubles
Silencers from 3000 rubles
Nozzles from 1000 rubles
Exhaust system repair from 1500 rubles
Exhaust production from 7500 rubles
Exhaust system tuning from 5,000 rubles
Replacement of components from 3000 rubles

Double exhaust can also be from a muffler.
See photos of exhaust systems in our gallery!

There are several types of dual exhaust:

When a dual exhaust has two mufflers, two resonators, two catalysts, that is, practically we have two exhaust systems.
When a double exhaust is made on one muffler, on one resonator and on one catalyst. Consequently, two exhaust pipes exit from the muffler, on the right and on the left.

Only fiction

The fact is that each V-shaped engine block has its own exhaust system. Two paths extend from each of them and bend under the bottom, where the pipes enter the catalysts, resonators and mufflers. And the larger the volume of the combustion chambers, the higher the diameter of the pipe and exhaust system as a whole. Therefore, on powerful cars, two pipes peeking out from under the bumper are structurally justified and even necessary.

Meanwhile, such cars are already a minority, and two tubes under the bumper are even installed on small cars with small 4-cylinder units. With their help, a certain sporty ambiance is given to models that are nothing special. In this case, it's just a sham. Moreover, not only garage tuners, but also designers of famous automakers go to such deception. For example, expensive trim levels of almost all crossovers are often decorated with two symmetrical pipes, which turn out to be fake.

Question and answer What service life are modern engines designed for?

Hyundai Solaris Fail Project › Logbook › Exhaust. Stage 228

This post will be very voluminous and informative. Lots of photos. Be patient. After the program was sewn up for E2, it was decided to remove the catalyst. Why is it there if the ECU no longer sees it? Now this is an extra node.

Having lit the drive, it became clear that this topic has been described and touched upon quite little. No descriptions of the process or reviews of the consequences of removal as such. And by the way, they are not very small, but more on that later.

Well, OK. Having experience in knocking out a catalyst on a pre-Restayl car, we decided to get down to business. There is nothing complicated about removal and installation. We unscrew the nine nuts from the plate near the block, one bolt securing the can itself to the block and two nuts from the exhaust pipe studs. Accordingly, the heat shield casing and lambda also need to be removed. The lambda can be easily unscrewed with a regular 18mm open-end wrench.

Let's look at the skate. Mileage 4 and a thousand kopecks. Nultsevy.

We take a longer screwdriver and dig the whole thing out from there.

We put everything in place and go test it. The sound of a fart rustling into a tin can appeared. But you can live with this quite calmly and it only appears under load at low speeds or when driving the gas to the floor. Not intrusive, doesn't hurt the ears. You can only hear it if you turn off the music completely. Another side effect appears. The catalyst works as a heat condenser in winter. I turned off the engine, the engine took a long time to release heat, and as a result the engine cooled down slowly. After removing the cathode, the engine cools down much faster. Tested on two machines. I was very surprised that the exhaust does not smell like a catless exhaust. But somehow I didn’t give it any importance.

Binge on butter? He is. But I will not undertake to say that this is precisely from the skate. Perhaps the oil burns away due to frying. I use Petro Canada supreme synthetic 5v30. I won’t say anything about the baby in top hats and the badass. This is an eternal topic and one can argue a lot. And that’s not what this post is about.

There are clearly changes in dynamics. The car rolls easier. At the top I didn’t feel the arrival. But at the bottom and in the middle it is there. Not exactly wah wah, but there.

And now, after a while, riding and thinking that I’m the most fashionable and cool, I find out that there is a second skate. WTF? What x? It can not be. Back then I didn’t know that I would end up with a lot of money and this was just the beginning of the journey.