John, I will try to get a pic tomorrow and post it. Not sure about whether or not it's restrictive, but it might be worth a few bucks to upgrade to a hi flow aftermarket cat as long as we will be fabricating a new Y pipe anyway. I'll check into it a bit more Thurs. and post results.

 

Count me in for sure!

 

Can someone recap the status? Lots of talk about y-pipes and stuff, but is a passenger side header prototype anywhere close?

 

Pic of passenger side prototype is on pg. 23 of this thread.

 

Is it the drivers side then that is now being worked on or is that the one that is already complete?

 

Bit and 98SS, both proto-types are complete. (left and right sides)

The current status is that JBrady put out a note to those that are on the confirmed list to find a volunteer to be "one of the first". No other bonus', just the luck of being one of the very first.

If the fitment goes as planned for that lucky first (or second or third) buyer, then the bulk of the rest of them can be made and sent out to those who are on the confirmed list. JBrady is keeping that list. The list is for *confirmed* buyers only.

 

Any updates? TXGS did you ever get a chance to go back to test fitment on the 430?

 

Anything new with this ???

 

I know that it is hard to be patient. The builder send flanges out to be cut. He is waiting on both the header outlet/catalyst inlet flanges and header to head flanges. Once they are back he will build the first actualy functional set and ship to me. I will install on a local GS400 to confirm fitment and get answers on install questions. We are very close but not their just yet.

 

Thanks for the update John. As always you efforts are appreciated

 

i am so ready.
I might actually ask a friend to see about making a x pipe, and see how it does on a dyno.

 

You can get them here: http://www.burnsstainless.com/Crosso...rossovers.html

Here is some theory on the benefits of X-pipes:

When you're upgrading a V8 exhaust system for performance, you'll soon discover that several companies offer X-pipes. Ever wonder why?

"The firing order of all production V8s, regardless of make, has one cylinder in each bank that will fire within 90 degrees of crankshaft rotation of another cylinder in the same bank," says Hedman Manufacturing (16410 Manning Way, Cerritos, CA 90703, 562-921-0404, www.hedman.com). "This occurs twice during completion of the entire firing order. These two cylinders will be exhausting almost simultaneously into the same [exhaust] manifold system. Full-length four-tube headers help separate these pulses until the collector is reached. After the header tubes dump into the collectors, the two cylinders again are fighting each other for space in the collector and exhaust pipe. The result is reflected pressure waves traveling back up the exhaust system, backpressure, lost power and poor economy.

"At the same time two cylinders exhaust in one bank, there is no activity in the opposite bank. The traditional H-pipe equalizer allows some of the excess pressure to bleed over [to] the 'quiet side' of the exhaust system, resulting in some low and mid-range torque improvements. At high rpms, however, the gases cannot bleed across the H-pipe fast enough to help power significantly."

That's why Hedman created the X-Treme Equalizer Pipe, which features a tangentially siamesed crossover junction to synchronize exhaust pulses. The X-pipe "splits the flow in the crossover junction, so the pressures on both banks will be equal and pulse-free after the crossover, regardless of the rpm," according to the company. "Volumetric efficiency and power are therefore improved at all engine speeds."

This article is here: http://www.enjoythedrive.com/content/?id=10185



Here's another interesting article on X-pipes: http://www.advanceautoparts.com/engl...0011101xp.html

Here's an excerpt from the article above:

For those who have vehicles where no X-pipe is available, a custom X-pipe can be made by any competent muffler shop by purchasing the X-pipe union and bending up some exhaust tubing to make it fit. If you are fabricating your own X-pipe, a tip is to place the X-pipe union as far to the rear of the car as physically possible—it will make more power that way.

What can you expect from this modification? A major performance-car magazine did a test on a 350 small-block Chevy engine and the results were fairly spectacular. Torque at 3,000 rpm jumped by 20 lb.-ft. and horsepower increased by 13. These are increases in the useable part of the rpm range and should not only result in quicker acceleration but better fuel economy as well.

What we haven't commented on is the sound. Connecting the branches of the dual exhaust in this manner makes for the sweetest-sounding V-8 you can imagine. Instead of hearing the firing impulses of two disconnected four-cylinder engines, you hear all eight cylinders out of each pipe. What a difference!

 

Haven't had time yet to really check out the website links, but looks interesting for sure!
It would really be nice to go all out on the exhaust system (headers, hi flow cats, x pipe, cat back exhaust etc.) along with an intake and tune with an Apex SAFC on a dyno!

 

with a full exhaust system and some dyno/safc time, there will be plenty of gains to be had. Id think a realistic number would probably somewhere in the 30+ hp range with intake.

 

I thought this thread is about headers not x pipes. Maybe needs to be split??

Anyways This sound comment also applies to y pipes. So dont expect some crazy v8 sound increase cause esentially our stock lexus exhausts are X -pipes in a way, since we go y to y in a reasonably short distance.. The quote above is referring to 'real dual exhaust', with no x or y pipes at all.

Things like these x pipes are easily sold by saying it does this and that, look at grounding wires for example, they make it sound like it gives you 10whp!! But all in all it was 120.00 wasted.......Do I have to mention the tornado intake system???

But lets go further, using hammeeds post.

"At the same time two cylinders exhaust in one bank, there is no activity in the opposite bank. The traditional H-pipe equalizer allows some of the excess pressure to bleed over [to] the 'quiet side' of the exhaust system, resulting in some low and mid-range torque improvements. At high rpms, however, the gases cannot bleed across the H-pipe fast enough to help power significantly."

Well in a y pipe the left side forces exhaust into the y collector then the right side forces exhaust in the y collector, but at WOT do these forces collide....YES, But they collide in an X pipe too even more. As long as the y pipe size is adiquate, the x pipes make 0 sence to me.

I made a diagram.