Y-pipe

[PathPro2002]

So I was looking to upgrade my exhaust and I found something called a y-pipe. I see that a lot of videos of 350z with exhaust that have a y-pipe. What exactly does this do because most y-pipes I found on the internet claim HP and torque gains. Would this be beneficial for my pathfinder?

Please explain your reasoning

[miamiheat3332]

Stock, they have one bigger pipe running down the middle, then it goes into a y pipe and out to a dual exhaust in the back. The stock one is probably restrictive or small, or this one has bigger outlet tips which in turn lets you run bigger pipes from the Y pipe back, which is why they claim HP gains. Our path has a single out, and it would be more benefical to run a TRUE dual, which is easier in our cars than said 350z, because the paths have 2 true pipes running down the car up until the resonator where it goes into one.

Just get exhaust shop to put in a custom cat-back.

Edit:

My original assumption was a little off though basically same principal -

350z stock exhaust on right - aftermarket on left




Edit: Heres a quick drawing of our path exhaust:



As you can see, just run larger pipe from both cats, resonator out, and in its place put a dual in, dual out muffler, then run a pipe straight back for the right side, and one left for the left side.

This is the best choice and i think what some people have done on here

[PathPro2002]

ohh ok, very nicely explained. I appreaciate you taking your time to explain this. So, no aftermarket y-pipe you say?

[miamiheat3332]

Nope, best option is what i put in the 2nd edit.

[PathPro2002]

Nope, best option is what i put in the 2nd edit.

Ok thanks! very helpful

[iceman14n]

Miami, arent you planning on taking the resonator off and making it a dual out?

[miamiheat3332]

What i might do in a month or so is get a dual in one out muffler, put it in place of the resonator, take off the stock muffler, put a piece of pipe in place of it, and have a better sounding / little less restrictive exhaust for like $50.

What i am going to do in the future is cat-back with larger pipe, or do the whole thing, get custom headers etc. And yes im going to do true dual, i might put on Y tips to make it look like a quad exhaust in the back, i think it would look a little badass but i dont want to overdue it either if it will look crappy.

[01silvapathy]

Right after the cats there are two pipes that run into the muffler which channels it into a single bigger diameter outlet which runs into the resonator which exits the rear of the vehicle.

I just took this pic since im currently running just dumped after the cats But anyways the two pipes are where the exhaust enters from the cats goes through the muffler and out a single pipe. My resonator was cut off long ago, so thats not in the pic but how its laying on the ground is how it would orient on the truck

[Innovazn]

Id like to note that Miami's drawing is "false" we have 2 (two) resonators that run into a dual in single out muffler.
As most have said, forget the y pipe, youre wasting money. Go with a dual in single out muffler and its just as good. Thas what i have going on and its working just the way i like it.


Delete the resonators to get true sound, less back pressure/restriction. Cats back.

[sicwitit]

I second Innovazn's comment.

the only other way to really open up your exhaust is to make some equal length headers, routed into some high flow cats, collect them in a y-pipe with a 2.5'' outlet, and into a single in/single out muffler. All bends will need to be mandral, and all welds should be tig'ed.

I feel like the last 3 yrs have been wasted because I could of been producing a complete exhaust for quite some time now. I've got some headers already that I'm 90% sure will work as a model to follow. I should be complete with my move in a couple months to include moving somewhere that has enough room for all my tools, and enough room to build some prototypes if your willing to wait. If not, then any competant welder can design something similar.

JT

[Innovazn]

I second Innovazn's comment.

the only other way to really open up your exhaust is to make some equal length headers, routed into some high flow cats, collect them in a y-pipe with a 2.5'' outlet, and into a single in/single out muffler. All bends will need to be mandral, and all welds should be tig'ed.

I feel like the last 3 yrs have been wasted because I could of been producing a complete exhaust for quite some time now. I've got some headers already that I'm 90% sure will work as a model to follow. I should be complete with my move in a couple months to include moving somewhere that has enough room for all my tools, and enough room to build some prototypes if your willing to wait. If not, then any competant welder can design something similar.

JT

every time you agree with me it makes me go

[01silvapathy]

Headers for a VQ? Im interested

[PathPro2002]

I second Innovazn's comment.

the only other way to really open up your exhaust is to make some equal length headers, routed into some high flow cats, collect them in a y-pipe with a 2.5'' outlet, and into a single in/single out muffler. All bends will need to be mandral, and all welds should be tig'ed.

JT

what do you mean by" collecting them into a y-pipe with a 2.5" outlet" ? I thought you agreed that the y-pipe was a waste of money. Sorry for the noob question but I dont understand.

[sicwitit]

the piping from each header has to be collected somehow right? so, you can do it with either a two in-one out muffler, or use a Y pipe which will do the same thing, cost a little less, and it will scavange a little more engine sound over a muffler or resonator. Thats all i'm saying.

the 2.5'' outlet is recommended only because we need a little bit of back pressure to make the cats function correclty since I havn't heard of anyone on these forums running forced induction on the Vq35 we all have. well, not yet, I do have a few turbo's laying around...

[PathPro2002]

the piping from each header has to be collected somehow right? so, you can do it with either a two in-one out muffler, or use a Y pipe which will do the same thing, cost a little less, and it will scavange a little more engine sound over a muffler or resonator. Thats all i'm saying.

the 2.5'' outlet is recommended only because we need a little bit of back pressure to make the cats function correclty since I havn't heard of anyone on these forums running forced induction on the Vq35 we all have. well, not yet, I do have a few turbo's laying around...

Well thats what I was thinking of doing. Collect the headers using a y-pipe

[Innovazn]

But now youre wasting money on a Y-pipe.... why not ask the shop what the cost difference is between straight 2 in 2 out / 2 in 1 out / 1y pipe, 1in i out ?

[PathPro2002]

But now youre wasting money on a Y-pipe.... why not ask the shop what the cost difference is between straight 2 in 2 out / 2 in 1 out / 1y pipe, 1in i out ?

If it gives some hp and/or torque and its not too expensive, I will get the y-pipe then

[Innovazn]

If thats what you think.... how fast have you gone with your truck?

Ill tell you right now, it wont help if you gain a touch more hp or an ounce of torque... its still an suv and that added hp/torque you THINK you put on it... is just wasting money.

I have hit 169km/h going down hill and floored.... you cant go any faster without your governer kicking in and stopping you from going any faster. enjoy wasting money yeah?

and as you said "claims on the internet"



ANDDD another note.... you dont have custom headers (and i doubt you will unless you s*** money) AND you wont be mandrel bending your pipes either (again i doubt you will unless you s*** money)

Arguably enough, crush bending and mandrel bending is near 500 dollars difference if not more. and a Y pipe + single in single out muffle will cost your MORE then a dual in single out... and SURPRISE it does the same thing :o

[PathPro2002]

If thats what you think.... how fast have you gone with your truck?

Ill tell you right now, it wont help if you gain a touch more hp or an ounce of torque... its still an suv and that added hp/torque you THINK you put on it... is just wasting money.

I have hit 169km/h going down hill and floored.... you cant go any faster without your governer kicking in and stopping you from going any faster. enjoy wasting money yeah?

and as you said "claims on the internet"



ANDDD another note.... you dont have custom headers (and i doubt you will unless you s*** money) AND you wont be mandrel bending your pipes either (again i doubt you will unless you s*** money)

Arguably enough, crush bending and mandrel bending is near 500 dollars difference if not more. and a Y pipe + single in single out muffle will cost your MORE then a dual in single out... and SURPRISE it does the same thing :o

Its limited to 105 MPH, but its not about top speed that I care about its just a little more acceleration that I want

besides, there isnt much that you can do to a pathy, so Im willing to spend a little extra, since this is probably the last mod that I will do to the path and im also looking for a possible air/fuel tune.

[Innovazn]

Its limited to 105 MPH, but its not about top speed that I care about its just a little more acceleration that I want

besides, there isnt much that you can do to a pathy, so Im willing to spend a little extra, since this is probably the last mod that I will do to the path and im also looking for a possible air/fuel tune.

[PathPro2002]

Its limited to 105 MPH, but its not about top speed that I care about its just a little more acceleration that I want

besides, there isnt much that you can do to a pathy, so Im willing to spend a little extra, since this is probably the last mod that I will do to the path and im also looking for a possible air/fuel tune.

It does not matter if its limited to 105 mph because its not practical to drive over 100 mph, so I just want better acceleration.

Also, only performance mods available for path that I know of is the CAI and a custom exhaust, so I do not mind paying a little extra for custom exhaust including headers.

If you know of any other performance mods please let me know

[Anamagous]

Hey guys,
Can anyone draw up a sketch of what It will look like once the two res. are eliminated and I put on a 2-in 1-out muffler? Also, what is the least expensive option to improving the exhaust. remove resi, 2-in 1-out muffler -----or----- remove resi and place a Y pipe directly after the cats into a larger diameter pipe into a 1-in 1-out muffler. Which one should I go for? seems like there is a lot of opinions about it in this thread? your advice please, thanks

[Innovazn]

Hey guys,
Can anyone draw up a sketch of what It will look like once the two res. are eliminated and I put on a 2-in 1-out muffler? Also, what is the least expensive option to improving the exhaust. remove resi, 2-in 1-out muffler -----or----- remove resi and place a Y pipe directly after the cats into a larger diameter pipe into a 1-in 1-out muffler. Which one should I go for? seems like there is a lot of opinions about it in this thread? your advice please, thanks

2 in 1 out reso delete.

y pipe is throwing money down the drain.

you need a certain amount of back pressure to run an engine and allow certain components to function properly. Hell, if that wasnt the case, everyone would run a straight 5" pipe all the way from the engine.

having 2 2.25 pipings run into a y to a 2.5 is creating a bit too much BP into a single in and out. (you go into a straight pipe muffler with a larger outlet which is more then likely a 2.5" any bigger looks absolutely retarded)

having 2 2.25 - a 2 2.25 in oval muffler (now this is a large oval muffler similar to stock) that creates less back pressure, but enough to allow things to function properly. into a 2.5 out, youre gunna save more money with this option...

My exhaust = Piping $50, Muffler ( magnaflow 2 in 1 out ) 160, Hanger and labour 100, Custom tail pipe + materials - 90 total 448.00.

Had i gone with a y pipe I was looking at about 50-100 dollars more. Shop owner himself said it wasnt a great idea for y piping the benefits (if there was even any) on the truck wouldnt do any good. If any he said an X pipe .

Shops a reputable shop that does most of the custom exhaust around town.

[sicwitit]

I love the X-pipe idea too, I've seen a very dope setup on a 600SL done with an X-pipe. only difference is it had 6 more cylinders then our Pathy's have! Well, maybe thats not the only difference, but you know what I mean.

You probably won't see any real benefit from a Y-pipe. Our engines just don't make enough power and unless your willing to invest some serious bones at building the engine, then you'll never see anything come from it.

Now if your a skilled welder, understand thermal and fluid dynamics along with mechanical engineering, and are just bored off your a**, then have at it man. get it done before I attempt to find out what I can. build a simple system that sounds the way you want it to and keep on truckin!

BTW, I'm back in the US now...and have all sorts of plans....stay tuned!

[PathPro2002]

I love the X-pipe idea too, I've seen a very dope setup on a 600SL done with an X-pipe. only difference is it had 6 more cylinders then our Pathy's have! Well, maybe thats not the only difference, but you know what I mean.

You probably won't see any real benefit from a Y-pipe. Our engines just don't make enough power and unless your willing to invest some serious bones at building the engine, then you'll never see anything come from it.

Now if your a skilled welder, understand thermal and fluid dynamics along with mechanical engineering, and are just bored off your a**, then have at it man. get it done before I attempt to find out what I can. build a simple system that sounds the way you want it to and keep on truckin!

BTW, I'm back in the US now...and have all sorts of plans....stay tuned!

What do those plans include??

[Anamagous]

Thanks guys,