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So the Z doesn't come with true dual exhaust....

Old 03-11-2006, 06:27 PM
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uncutZ00
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Default So the Z doesn't come with true dual exhaust....

does the S2000 come with true duals? how about the Neon SRT 4? What about the 05 Mustang GT's?


I realize the Z's 2 exhaust is kinda just for looks, would putting in true dual exhaust make a big difference in terms of performance?
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Old 03-11-2006, 06:34 PM
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jaminkid
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I'm not really a fan of dual e's. Planning to change soon.
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Old 03-11-2006, 07:05 PM
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To answer your first question, neither the S2k nor the SRT-4 I believe are true duals. The Mustang GT is (has been) as well as the Corvette.
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Old 03-12-2006, 04:22 AM
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Sean
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true duals require 2 cats, something to keep in mind
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Old 03-12-2006, 05:29 AM
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Originally Posted by uncutZ00
does the S2000 come with true duals? how about the Neon SRT 4? What about the 05 Mustang GT's?


I realize the Z's 2 exhaust is kinda just for looks, would putting in true dual exhaust make a big difference in terms of performance?
No. In fact a "true dual" is more a marketing gimmick than anything else. So long as a single is of the proper size and configuration, it will yield better performance than a dual due to better exhaust gas heat energy retention (which maintains exhaust gas velocity) and less turbulence due to reduced gas/pipe wall interfaces. A true dual exhaust is only really beneficial when the exhaust gas volume from very large motors necessitates piping diameter that would simply be excessively large to build and mount as a single pipe. A well designed single is also lighter in weight than it's dual counterpart.

Last edited by Speedracer; 03-12-2006 at 05:33 AM.
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Old 03-12-2006, 07:10 AM
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Sorry, what do you mean exactly by that statement since the 350Z's stock exhaust system has 2 cats.

Originally Posted by sean1967
true duals require 2 cats, something to keep in mind
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Old 03-12-2006, 07:22 AM
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Originally Posted by Speedracer
No. In fact a "true dual" is more a marketing gimmick than anything else. So long as a single is of the proper size and configuration, it will yield better performance than a dual due to better exhaust gas heat energy retention (which maintains exhaust gas velocity) and less turbulence due to reduced gas/pipe wall interfaces. A true dual exhaust is only really beneficial when the exhaust gas volume from very large motors necessitates piping diameter that would simply be excessively large to build and mount as a single pipe. A well designed single is also lighter in weight than it's dual counterpart.

Real world numbers from the 350Z sports magazine dyno shoot out awhile back. Look at torque and where the power is delivered and over what range.
Note that the top 3 are TD setup's, though if we want to split hair's the Stillen does use a X crossover and the Borla a H crossover. Also, the Injen tested is not the current straight tip, don't really see where that would effect numbers anyhow.

Borla (car 2) = 8.2 Hp - 2.7 ft/lbs torque (peak values)
HP increase from 5500 rpm to 6500 rpm range. Lost HP & torque below
1800 rpm. 60mm pipe. Weighs 52lbs.

Stillen (car 1) = 8.1 Hp - 7.3 ft/lbs torque (peak values)
Hp and torque increase starting around 3000 rpm to redline. Lost a
little Hp & torque below 1800 rpm. 60mm pipe. 74lbs - 10 lbs heavier
than the stock system.

Injen (car 1) = 7.6 Hp - 5.1 ft/lbs torque (peak values)
Small torque loss at 2800 rpm. Torque gain starts at 3300 rpm. Small
Hp increase starts at 3300 rpm, maxing out from 5800 rpm to redline.
Major loss in Hp and torque below 2200 rpm. 49lbs.

Nismo (car 1) = 6.3 Hp - 4.5 ft/lbs torque (peak values)
Developed torque and Hp over wide rpm range. Torque increase starting
at 3000 rpm. Most HP increase from 4800 rpm to redline. No power
losses below 1800 rpm. 54lbs.

5Zigen (car 2) = (-3.4) Hp - .02 ft/lbs torque (peak values) Lost Hp,
no real torque gain. Most expensive. Loudest. 58mm pipe. Lightest
@ 25lbs.
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Old 03-12-2006, 08:52 AM
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what about the buick lesabre?



haha
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Old 03-12-2006, 09:19 AM
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i have the borla system.... bought for sound, overall its been a greaaat system, i use test pipes instead of cats, system weighs alot.... but if your going to buy... borlas the way to go...
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Old 03-12-2006, 09:30 AM
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Originally Posted by mxjosh711
i have the borla system.... bought for sound, overall its been a greaaat system, i use test pipes instead of cats, system weighs alot.... but if your going to buy... borlas the way to go...
If you don't have cats, how do you pass inspection? Sorry if this is a stupid newbe question.
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Old 03-12-2006, 10:01 AM
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put them on at inspection time =)
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Old 03-12-2006, 11:16 AM
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Originally Posted by ckny
put them on at inspection time =)
+1
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Old 03-12-2006, 12:25 PM
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You guys forgot about HKS Hi power. 14hp increase but at $1500!
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Old 03-12-2006, 12:29 PM
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Originally Posted by ZlleH
Sorry, what do you mean exactly by that statement since the 350Z's stock exhaust system has 2 cats.

if he runs two pipes down the bottom sides, he will need 2 aftermarket cats if he doesn't want to bottleneck his new setup,
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Old 03-12-2006, 01:42 PM
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Sorry, still not making sense, I have the Borla TD which has two pipes running down the bottom and I didn't need to buy 2 aftermarket cats.

Look at the bottom pic, the left is Borla TD, and the right is the stock. Now where would you need to buy 2 aftermarket cats to make it work?

I can see people wanting to buy HFC like I did to make it work better but it doesn't "require" aftermarket cats.



Originally Posted by sean1967
if he runs two pipes down the bottom sides, he will need 2 aftermarket cats if he doesn't want to bottleneck his new setup,
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Old 03-12-2006, 02:51 PM
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Originally Posted by Speedracer
No. In fact a "true dual" is more a marketing gimmick than anything else. So long as a single is of the proper size and configuration, it will yield better performance than a dual due to better exhaust gas heat energy retention (which maintains exhaust gas velocity) and less turbulence due to reduced gas/pipe wall interfaces. A true dual exhaust is only really beneficial when the exhaust gas volume from very large motors necessitates piping diameter that would simply be excessively large to build and mount as a single pipe. A well designed single is also lighter in weight than it's dual counterpart.
You beat me to it!

I had duels for a little while and I actually lost power...
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Old 03-12-2006, 09:01 PM
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Originally Posted by ZlleH
Sorry, still not making sense, I have the Borla TD which has two pipes running down the bottom and I didn't need to buy 2 aftermarket cats.

Look at the bottom pic, the left is Borla TD, and the right is the stock. Now where would you need to buy 2 aftermarket cats to make it work?

I can see people wanting to buy HFC like I did to make it work better but it doesn't "require" aftermarket cats.


aren't there 2 cats in the middle of that set up on the left?
and if both pipes spill into the same muffler, rather than there being 2 seperate chambers in it, than it isn't a dual

Last edited by Sean; 03-12-2006 at 09:04 PM.
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Old 03-12-2006, 09:19 PM
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ZlleH
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I don't want to get into the true dual arguments. This response was about a poster who said you were "required" to buy 2 aftermarket cats to make a dual exhaust system work. The photograph above was to show that a cat-back exhaust system is just what it means, an exhaust system from the cat and back...

Hence why I am trying to make sense why the poster was saying that you are required to buy 2 aftermarket cats to make a dual exhaust system work.

And to answer your question... The two things in the middle are resonators.

Am I the only one alone on this?

Here, I'll make it even easier:


Originally Posted by sean1967
aren't there 2 cats in the middle of that set up on the left?
and if both pipes spill into the same muffler, rather than there being 2 seperate chambers in it, than it isn't a dual

Last edited by ZlleH; 03-12-2006 at 09:47 PM.
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Old 03-12-2006, 10:25 PM
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nope
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Old 03-12-2006, 10:43 PM
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ok, you show the two cats, what i was saying in my very first post is that you would need to buy to high flow cats as opposed to just one, price consideration is all i was getting at.
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