Need more power!!!!

Here is what I was talking about, to free up restriction. Now, this was done on the URD y-pipe. Same applies for the factory y-pipe.

The catback exhaust that is factory, is 2.25" OD. If you install an aftermarket exhaust, it will be either 2.5" or 3" depending.

Where each bank of the y-pipe comes together, it bottle neck right before it goes into the catback. Being that the URD y-pipe is a even 2.25" OD, mandrel bent, it is even more apparent the restriction before going into the Catback. Keep in mind, your exhaust is only as large as the smallest opening.

Since the factory Y-pipe is of multiple sizes and not mandrel bent, there is even more restriction in it than the one in the URD Y.

Here is Toon's adaptation:

You can see how it tapers smaller to the outlet, which is on the wood.





Afterwards you can see how it is nice and equal in dimension, with a V-band flange on it.



Here are the outlet size differences, between the flange that was cut off, and the exhaust now.

 

Here is a good shot from Outlaw7's build.

Comparing the two Y-pipes.



You can still clearly see the restriction. Necessary on the URD Y-pipe, to maintaing its flexibility to mount to many different exhaust forms, including the factory one. Very smart actually.

Some more shots of what he did to his URD Y.







http://www.xr-underground.com/forum/showthread.php?t=46351

It really does open up the flow. Like taking a restrictor out of the exhaust.

 

^^^^ wish I could run full exhaust what brands do you guys prefer then when it comes too muffler? Sorry not meaning to thread jack but dont want to start a new one

 

So basicaly anything but flowmasters? Haha

 

Well, Aeroturbine isn't being made any more, but if you can get a resonated one of theirs, you are really lucky. All 304 stainless, and no packing to blow out.

Bassani, Magnaflow, Vibrant Performance, Dynomax, address a few more.

 

psh. mike I said 2jz with 50shot nas. Not "just" nas

 

so is that a for the trd set up or not?

 

Both of those are on a TRD setup.

 

Toon ended up going turbo, so he sold his modified URD Y.

 

Toon has a PreRunner, and Outlaw a 4x4.

 

For something that sucks they sure do sell a lot of them

Go figure

 

im still at a loss yes or no for the average joe is this worth doing?

 

Since some people wont answer your question, I dont mind answering it

I have run Flow master, Dynamax and just got a MagnaFlow and I like MagnaFlow on my current truck

Each different muffler will have it`s own sound, many shops will put on several different ones and let you hear them if you have them do the work

Good luck in the decision

 

thanks i'm not sure why that was so hard...not everybody knows everything i try & do my research first and my proves it to me w/ the help from people on here. now sound isnt real important to me im just looking for feelable gains thanks again btw s/c in near future

 

I love my dynamax. Great sound. Headers and exhaust made nice gains on my 01 2.4L that I could feel. So did the underdrive pulley. What gear ratio's are you guys running on your Forced induction taco's. I would like to go a lil faster top end and not feel like the truck is topping out at 90-95 mph.

 

The cool thing abiut 4 and 8 cylinder engines is that you can run Tri-Y headers for an increase in torque over regular long tube headers. Tri-Y headers offer better scavenging.

^^^ Which style were you able to go with?

 

^^^^ THIS

 

If you're going to go through that much trouble to change the flange where it meets the cat-back pipe, why would you leave the standard-restricted flanges where the Y-pipe meets the header?

(also don't think I'd have the balls to cut up a $500 Y-pipe)