What are the best v-twin exhausts? | Slip-on Vs 2into1 Vs 2into2

types of v-twin exhausts

Welcome back to our weekly date dear riders. Today we want to talk to you about a topic that touches us very personally: the v-twin exhausts. At first sight, the matter could look not too much complicated. But actually is pretty complex. There are a lot of discussions on the subject, with clashes sometimes not entirely peaceful, especially in web forums. Some riders would only mount open exhausts, other ones exclusively  2 in 2, many would only take just 2 in 1… There are also people who mount nothing at all(please.. just why?..)!

Anyway, we are not here to generate flame. Instead, we just want to give you a general overview of ​​the benefits and cons that each type of exhaust brings with it. So you will be able to choose the best exhaust system that better fits your needs.

First things first, no exhaust type is always better than others. It is only a matter of personal objectives, tastes, feelings and sensations.

So, let’s dive right into them!

What will we cover?

  1. Slip-on exhausts
  2. Full exhaust systems
    1. 2 into 1 exhaust systems
    2. 2 into 2 exhaust systems

1. Slip-on exhausts

64001TOB details on bike
Redthunder slip-on muffler

The pros:

The best advantage of slip-on is that you don’t actually have to change the whole exhaust system. Slip-on exhausts are a quick and easy option. When you buy a slip-on exhaust, you are essentially just replacing the muffler section of your exhaust system. You will gain some horsepower and change the sound. It’s fast, simple, and in most of the cases cheaper than a full-system.

The cons:

On the other hand, it will not provide many changes in terms of power and look when compared to full exhaust systems. However, these small defects can be partially avoided by choosing quality products. The changes will not be substantial, but with slip-on like the Redthunder, you will surely have an upgrade in power, sound, and weight saving.


2. Full exhaust systems


If you want to get a more noticeable change, then you should consider getting a full exhaust system. Talking about Harley Davidson, the most difficult choice is between 2 into 1 system or 2 into 2 system. Both the two will absolutely dope your bike giving you A LOT in terms of performance.

Let’s see the main differences between 2:1 and 2:2 systems:

2.1 – 2 into 1 exhaust system


With 2 into 1 exhaust systems, the two exhaust pipes combine to emit fumes through one muffler. The advantages obtained with this configuration vary according to the shape, length, and curves of the pipes. Another thing that affects the benefits is the muffler and the back-pressure it can generate. All these things change between the various brands, but here we will talk about the system in general. The main advantage is the power increase and the power delivery, especially at low RPMs. Another good point is that these pipes are also typically lighter, reducing your bike weight.

Redthunder Full 2into1 Exhaust for Harley Dyna - Ceramic Black
Redthunder 2 into 1 v-twin exhausts

This design also aids in one other special advantage, a benefit referred to as scavenging. When the first cylinder sends a pulse of exhaust shooting down the pipe, it helps to pull oxygen into the second cylinder. Then, the second cylinder helps the first in the same way, and the cycle goes on.  2-into-1 exhausts can offer a better-balanced airflow in your engine which can result in more torque and a smoother idle.

The most controversial issue for the 2:1 is that of sound. Surely this differs from brand to brand but these systems are generally characterized by a darker and roaring sound. Undoubtedly a very pleasant and enveloping sound, which however affects the potato-potato and could annoy the more purists. The only real small flaw of these systems is that they may hinder top-end performance. But also in this case the brand could resolve the issue.


2.2 – 2 into 2 exhaust system


Where 2 into 1 pipes are more common on smaller, more sporty bikes, true duals are more common on baggers and touring bikes. They give your bike a more balanced look thanks to their two separate mufflers, each emitting exhaust from one of the cylinders. These systems perform best at high RPMs, making them best for top-end performance, but leaving a little emptiness at lower RPMs.

Twinoza x Redthunder 2 into 2 exhaust system for Harley Davidson Touring
Redthunder 2 into 2 v-twin exhausts

They also provide that stereotypical Harley potato-potato for the purists’ happiness. And if you want the pipes to be louder, you can remove the baffles.  But because this removes back pressure, it might hinder performance. For that scavenging phenomenon of the 2:1, you could consider the 2:1:2 configuration. This means that the pipes combine for a short time before splitting again, meaning you can have that classic true dual look and the increased performance brought on by the scavenging effect.

It’s important to remember that when you make the change in your motorcycle’s exhaust, the work doesn’t end there. If you’ve succeeded in increasing the airflow out of your cylinders, then the fuel/air ratio should be changed as well. Without a change, your engine might run lean, and you’ll need to either re-jet or remap your motorcycle. This probably isn’t necessary if you only changed the muffler, but the bigger the change, the more important it will be.


Here is a small comparison between different types of v-twin exhausts. As said at the beginning, the choice of the best is up to you only, there is none better. Take a tour on our website and find out what suits you best. Let us know what you think and keep up to date with our newsletter and our social networks. We are always available for you. 😉

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