00:00 So have you guys ever wondered of why an aftermarket exhaust sounds so much more aggressive, so
00:12 much more brutal than a stock OEM exhaust?
00:15 Well, in this video, we'll be speaking about that and we'll be talking about how an exhaust
00:20 system actually works.
00:22 Welcome to DriveSpark, I'm Vedant Johari and we are at NMW Racing to see how an exhaust
00:27 is actually built and how it performs.
00:29 So your exhaust has four main components.
00:32 Starting off, you have your header, you have your catalytic converter, then you have your
00:35 muffler and finally you have your end can.
00:38 So how does this work?
00:39 Well, you can think of it as how a furnace works.
00:42 The exhaust system works very similarly to an actual furnace.
00:45 So first off, in the manifold is where all your fuel gets burnt.
00:50 Then after your manifold, where your gases are produced and everything, it goes through
00:54 your headers.
00:55 So once the gas is passed through your header, they go into your catalytic converter.
00:59 Now your catalytic converter is where the main work of the exhaust takes place.
01:03 Now from the manifold, a lot of harmful gases are produced, a lot of sound is produced and
01:08 a lot of hot air is produced.
01:09 So once the gases from the manifold pass through your header, they enter your catalytic converter.
01:14 Now inside your catalytic converter, the main work takes place.
01:18 So firstly, a lot of the harmful gases from your manifold are reduced, a lot of the chemicals
01:22 are reduced and the sound is also reduced.
01:25 Being a hot engine, a lot of sound is produced with each compression.
01:28 Now in your cat, all of that gets negated.
01:31 Well, it gets negated to an extent, let's say, it doesn't go fully silent because there
01:35 is sound coming from every engine.
01:38 Now after your catalytic converter, you go into your muffler, all the sound is passed
01:42 into your muffler and finally from your muffler, it goes to your end can and that's where your
01:47 exhaust fumes are released and that's where the sound of the engine actually comes from.
01:51 So all in all, those are the four main components of an exhaust system and that's how the gases
01:55 are passed from your manifold all the way till it exits your motorcycle.
02:00 So now in my hand, I have a performance muffler made by NMW Racing.
02:05 So now let's talk about the difference between a stock exhaust system and a performance exhaust
02:09 system.
02:10 Right now, this is a performance muffler that I have and so as I said, after your catalytic
02:15 converter, the gases pass through a muffler and then your end can.
02:18 Now this is just one part and this technically consists of your muffler and your end can.
02:25 So if you look at it from inside, you have two parts, you have one smooth part and the
02:30 end part with glass wool.
02:33 So now once the gas is passed through your catalytic converter, it enters your muffler
02:37 from this end and it keeps creating cycles and compressions inside the main muffler and
02:45 after that, it exits from this end.
02:48 So now inside this that I have, you might just think it's a metal piece inside, but
02:54 no, half of it is metal and half of it contains this material called glass wool.
02:58 So now the glass wool inside this helps in two things, one in creating back pressure
03:04 and two in compressing the sound.
03:06 So you won't get a very loud sound nor will you get a soft sound.
03:10 At the end of the day, this is a performance exhaust, so your sound will be altered.
03:14 So now the back pressure that we have inside the muffler helps in creating extra power
03:18 for your motorcycle.
03:19 So how does that work?
03:20 Well, basically all the gases that are being cycled inside this, a little of it will be
03:25 sent back with a little bit of fuel back into your engine to create that extra bang.
03:31 So now you're back in the third compression, which is your bang.
03:34 So the air will go back into your engine, create the bang and then be sent out again
03:40 and the cycle just repeats.
03:41 So each cycle that you have, you will have back pressure going into your engine and coming
03:45 out again.
03:46 So all in all, this is the difference between a performance exhaust like the one I have
03:49 in my hand versus a stock OEM exhaust.
03:52 Let us know if you have any doubts or clarifications in the comment section down below and I'll
03:57 be more than glad to help you out.
03:58 Don't forget to like, share and subscribe.
04:01 My name is Vedant Johari, signing out.
04:03 (upbeat music)
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