Who makes and what models??

 

Greddy EVOII

 

Borla, Injen, Stillen

 

what are the pipe diameters on those? I take it 2.25"?

I've been thinking about doing true dual exhaust for a long time but ended up with
headers to 3" single to dual 2.25" at the end instead for ease.

Do these systems have x-pipe balance merges or H-pipes or anything? Hopefully they do have the x-pipe cause you guys would be making alot more than no balance pipe, or merge.

 

When I think of true dual I think of the Injen and the Greddy since both have individual mufflers and you can tell the pipes never meet. If they had an X-pipe or an H-pipe, they wouldn't be true dual in my mind cause the pipes meet.

 

a true dual without x-pipe or h-pipe equals
much worse performance, and much louder. Balance pipes = merge pipes = MUCH MUCH better performance than true dual.

All true dual exhausts use x or h-pipes. Including big block guys, down to mustangs, comaros etc.

It wouldn't be in the cat-back section it would be near the headers. Probably what you guys refer to as the "test pipes"

 

Ultimate just released theirs as well:

http://z1auto.com/prodmore.asp?model...st&prodid=1183

 

What are the gains for for Ultimate?? Looks nice I would like some reviews on this

 

I know from experience that you would not want a true duel exhaust set up for this car. You would lose too much back pressure and performance would suffer just so you can have a sick sounding car.

I did this with my Chevy Avalanche. Right before I sold it I installed the Dynomax headers with high flow cats. While the truck sounded sick I learned pretty quickly that I should have stayed with the Edlebrock headers that I had on.

 

Actually that is incorrect. Just because one dual exhaust on a car lost power does not mean they all do. That was more of an improperly sized exhaust setup for the particular car, I suspect. Going too big will cost you power.
I have the UR true dual exhaust on my GReddy TT Z. It is 2.5" all the way from the O2 housings back (cat deletes on).
True dual exhausts should actually have an x- or h- pipe to balance the flow. It does help with power. I find the system not overly loud and it sounds very unique. I am completely happy with the setup.
The UR kit has an H-pipe in it. It uses dual Magnaflow oval mufflers and fits extremely well. I noticed a big seat of the pants improvement over stock exhaust (obviously) with the TT kit.
Feel free to check out the pics on their site.

Mark
www.Quantum-Racing.com

 

Ok You caught me making a generalization. I should have said I know from experience that you would not want a true dual setup on the cars I have installed exhausts on. Thanks for keeping me honost.

 

There was another thread just a couple of days ago that went through some of the debate over true dual vs single, etc. Check it out...

https://my350z.com/forum/showthread....threadid=96372

 

single exhaust is actually superior to any sort of dual exhaust, but problem is that the single pipe diamter on high power cars needs to be BIIIIIIIIIIIIIIIIIIIIIIG like 4-5"+ and thats why dual exhaust is used.

BUT this does not include single exhaust
to a dual split at the back, singe exhaust with dual splits is TERRIBLE for exhaust flow.


That ultimate setup looks nice but dual 2.5" piping for anything but FI would be
bad. If you plan to stay N/A go with dual 2.25" which is good up to around 350hp at the crank before it becomes a restriction.

 

why is dual 2.5 inch piping bad exactly?

What is the outlet on the turbo manifolds out there.......

 

I believe the Ultimate exhaust matches the GReddy outlets exactly.

 

because bigger piping is not always better. Using dual 2.5" piping is like using
4"+ single exhaust. Its HUGE for a 280hp car. velocity will definitely suffer IMO. BUT you can grow into it later where 2.25" would become a restriction soon as you add FI and for the price you Z guys pay for exhausts, buying it twice would not be fun.

 

also do the Z headers have 2.5" collector piping? or are they 2.25" generally? if its 2.25" i would definitely stick with 2.25" test pipe and cat-back. If anything its better to decrease pipe diamter the closer you get to the end of the exhaust, not the other way around. Not so bad if you plan to upgrade to headers with 2.5" collectors though.