This is the only Tanabe Y-pipe I could find. It says the outlet is 70mm. Does that convert to 2.5 inches?

 

Just divide by 25.4 to get inches, so 70mm is approximately 2.76 inches.

 

Ok , so the Tanabe pipe pictured above is a very close fit to the stock mid pipe.

 

Great thread! Thanx SI_G35Coupe for the info

 

I've had my new y-pipe on for several weeks now
along with the new cat-back system. I searched
and talked to several people but ended up with a
Top Speed y-pipe. It's all 2 1/2" into a 3" collector,
totally polished and looks like a showcar piece.
Like everyone in the know says, "it bolts on"!!!!!
Delivery was quick and the price was good, located
on this site under exhaust........LOL.

 

The Tanabe Y Pipe is out, it has 60MM inlets, and a 70mm outlet. It's pretty much the smallest diameter Y Pipe available besides the Kinetix Y Pipe. (I dont even think Kinetix makes it anymore)

If it's true that the stock exhaust is 2.5 inches that = 63.5MM.

High Flow cats are 2.25 (57MM).

My headers are (55MM).

So, if your keeping your stock exhaust, you might want to get a custom built Y Pipe, something with like 58mm inlets, and a 63MM outlet.

If your going to get a aftermarket exhaust, like a Fujitsubo (76MM), then make sure you get a Y Pipe with outlets equal to or smaller then 76MM.

As for me, i already have headers and cats in the garage waiting to be installed. But i wont install them until i have aftermarket y pipe and exhaust.

My setup will be like this:
The headers are 55mm, connected to high flow cats that are 57mm on both ends, connected to what will be the Tanabe Y Pipe with 60MM inlets, and a 70MM outlet, and a Fujitsubo exhaust with a 76mm diameter.

So thats, 55mm to 57MM, to 60MM, to 70MM, to 76MM.

 

hope you don't end up cracking your cats because of it

 

Yep, its just 1/4 inch (6.5MM) bigger then stock midpipe.

In fact, i thought i read the stock mid pipe was 2.5 diameter, but with a 2.75 inch flange.

 

The HKS Y Pipe goes from 2.36 Inch inlets, to a 2.55 inch Outlet. That would mate well with Hi Flow Cats (2.25 inches) and the stock exhaust (2.5 inches).
HKS Y Pipe is kinda pricey tho at $470.

HKS Y Pipe (2.36 inlets to 2.55 outlet) ($470)


Stock Y Pipe. (Dont know diameter)


Tanabe Y Pipe (2.36 inlets to 2.75 outlet) ($370)

 

anyone know where to purchase an hks y-pipe?!?!

 

Does the megan y pipe fits the fujitsubo exhaust? Any problem with this setup. I just feel that fuji y pipe is way too expensive, i know that the quality is good but i dont think is worth the price. Any problem with the megan y pipe?? Help thanks

 

As others may have mentioned, a reducer cone solves this.

I have a NEW, never-installed, NISMO Y-pipe with new Dr. Gas reducer cone (for use with the Y-pipe with the stock rear-section exhaust) for $400 SHIPPED if interested. These are two individual pieces, neither of which has ever been used.

-Ron

 

http://www.hopupracing.com/hksypini35in.html