Exhaust Header – Explained


Hello everyone and welcome to this week’s video today, I’m gonna be explaining exhaust headers and uh exhaust headers are basically one more step if you are working on getting a full new exhaust with larger diameter of piping throughout it So if you haven’t yet watched my video on cat back exhaust or my video on how to increase horse power via the exhaust should probably check out those first, i’ll include links in the description Now this particular exhaust header is a
Yonaka header for Acura Integra b-series engines and so I’m just gonna
be kind of going over this and how these are used to increase horsepower so the exhaust header is the first
piping after the exhaust from the engine exits through the cylinder head and
starts to leave out of the car, so the purpose of a performance exhaust header is clearly to increase horsepower Now it does this with two main ways: first of all, it’s going to have larger
piping so for example with this Yonaka header it’s going
to have one in five eighths piping for the primary pipes coming out and then it
is also going to have a 2.5 inch collector, the collector is where all of
the individual types join together and then go out to the exhaust as one
throughout the rest of the system. So, the other thing this does is it supports
scavenging, so the longer these long tubes support exhaust scavenging so if
you’ve watched my video on how exhaust can be used to increase horsepower you should be able to understand that as
far as how scavenging is done in order to increase horsepower. So one of the things that’s common with after market exhausts, especially in the Honda Acura Japanese market world
where we’ve got four cylinder engines is a four-to-one header or a 4-to-2-to-1 header
and basically all that is is describing how the piping joints together and
finally forms into one so the 4-to-1 you take all four and then
they just go to one just like the name is when the 4-to-2-to-1 two of the pipes
joined together and then finally the only after that so little difference and I
look at some dyno charts online just kind of see some main differences here
and it doesn’t look like there’s a huge main difference but the powerband
shifted a little bit hotter with the 4-to-1 rather than the 4-to-2-to-1 so this is a very exaggerated curve here, but basically you have torque on one side and RPM on the other the 4-to-2-to-1 header
is going to kind of have its peak torque a little bit lower rpm than the 4-to-1 header and once again at the graphs I looked at online it didn’t seem
to be a huge difference so it’s not anything major like I’ve shown here and
then both of them seem to have a decent advantage over the stock if you did have
an engine with a significant amount of power. So of course with these kind of
things with the larger piping you’re going to want to match it to your
horsepower so it’s not necessarily if you have very little force arranging
getting larger header may not be beneficial and I kind of go more into
this in my video on catbacks that’s kind of why I reference checking that out, but
Yonaka says the header that they supply is good for about five to 10
horsepower on the stock engines and of course that’s more effective if you have
a more powerful engine. One of the things with these pipes is
the large you create these individual pipes and larger the collector is your
kind of shifting where the peak torque is going to occur to a higher rpm so
larger piping you’re going to have a better flow at higher rpm when you’ve
got a lot more flow so it’ll kind of shift that torque that peak torque up
into the higher rpms. Some of the challenges
involved with an exhaust header, especially one with longer length pipes
is that the install can be kind of a little more complicated where you may have to remove some
components, move components and also weld the end on to the catalytic
converter or the rest of the exhaust that you’ve got going on also you can run into clearance issues
especially with lower cars as this exhausted or maybe the lowest part in
your car and so if that’s the case you want to make sure that’s kind of
protected or that it’s not really that low for the area that you’re driving in so just taking a look at this Yonaka
header, this is a stainless steel header and you can see the one and five-eighths
inch piping heading down and that all means up to a collector and then at that
collector you’ve got a 2.5 inch piping and that’s the outer diameter so the
inner diameter is actually little bit smaller and then here is where you can i
install the o2 sensor. I can just place that right in there. So, thanks for watching if you have any questions or comments feel free to leave them below and I will include a product include a product link in the descrition