What is the difference from Y & X pipe?
 

I recently installed my new HFC and CBE which both pipe diameter is 2.5.
However, the tech told me that I should look into getting a new Y pipe because the stock on the Z is a little bit smaller causing the airflow to not pass through easily. What's the pros and cons of a X and Y pipe?

Thanks in Advance!

Same design at the end of the day.

Difference is that a y-pipe has another "Y" on a different pipe splitting the airflow.
On an X-pipe segment it joins the tunes then splits on 1 segment

Which CBE did you purchase? The majority of the aftermarket exhausts for our cars have X pipes from what I can see. ARK, Fast Intentions, Invidia, and top speed to name a few. Generally, X pipes give better results through out the power band as compared to H or Y pipes due to better flow and exhaust scavenging. See below for visual:

H pipe: https://www.google.com/search?q=y+pi...COb6IyEOG4M%3A

Y pipe: http://www.jscspeed.com/images/catal...thumb_full.jpg

X pipe: http://www.garageline.com/277-441-la...pipe-combo.jpg

I am a little confused here. You had high flow cats and a cat-back exhaust installed, right? How is it that you need replace the X/Y pipe when that should be part of your cat-back? Used? E-Bay?

yeah what did you buy? not making sense.

x pipe is best for our cars

FPenevy post a great response on the differences in your other thread

I bought the Apexi RS exhaust from another forum member... heres that parts it came with: http://www.apexi-usa.com/store/rsx-m...70z-836.html(I didn't pay that much haha) But the only thing that was left stock was the Y-Pipe and the tech said investing in a custom one would benefit the car cause the stock Y-Pipe is shitty.

I bought Berk HFC, Apexi RS CBE that also came with a Mid pipe.

I saw it lol

Ahhhh. Gotcha. You couldn't get the front section from Apexi or a reseller?

There is a science that goes into designing Y pipes and X pipes.

You want to use a Merge collector style, such as Vibrant or Burns stainless design in my opinion when going with a Y pipe such as below.

http://vibrantperformance.com/catalo...10350_WEBL.jpg

And for an X pipe, this design has different inlet and exiting taper degree angles. Which as stated above is essentially two 2-1 merge collectors mated together.

http://www.burnsstainless.com/images.../X-pipe_wb.gif

These designs above are what you want.

You don't want those siamesed or extreme wide angle X pipes such as these styles below...

http://www.performance928.com/images...es/ci_1038.gif
http://www.performance928.com/images...es/ci_1039.gif


"The book, "Four Stroke Performance Tuning" has a section on exhaust where the author, A. Graham Bell, explains the design of the venturi merge collector. The V2 section is two of these merge collectors joined together at the constriction point. The inlet pipes merge at an angle of 9 to 12 degrees each for an included angle of about 20 degrees. A scan of that page from his book illustrates the design. My point is that when experienced exhaust designers design a Y merge, or V2 section, they do not use the wide angle V2 or siamesed bend sections joined on the outside"

http://www.performance928.com/images...es/ci_1037.gif


Hope this helps some, if you guys are into the technical aspect of it all.

In my opinion though MOTORDYNE engineering has got it right for the 350/370z crowd.

They know what they are doing when it comes to exhaust setups.