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True Dual Exhaust: Good or Bad???

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Old 07-03-2009, 07:04 PM   #1
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True Dual Exhaust: Good or Bad???

I am considering getting true dual exhaust for my 09 tacoma prerunner v6 4.0L.
True Dual would be easy for me because i have 2 cats on each side so they would just have to cut off the y pipe and make it go straight back to my dual tips (that i will get) i will get straight pipes cat back no muffler

I have been reading several posts about true dual and it looks pretty controversial. some people like it others dont.

Is there anything i need to know before i get this exhaust done?

Also if i do get true dual which should i get the H-Pipe or the X-Pipe?
(to lessen the scavenging effect)
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Old 07-03-2009, 07:16 PM   #2
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If your not going to supercharge your truck, you will loose power.
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Old 07-03-2009, 07:33 PM   #3
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you'd be better off getting one of these + a y-pipe if u want.....or the flowmaster dual catback

http://cgi.ebay.com/ebaymotors/MBRP-...Q5fAccessories
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Old 07-03-2009, 09:04 PM   #5
With sufficient thrust, pigs fly just fine.
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Quote:
Originally Posted by JK4 View Post
would true dual sound better than a regular exhaust system?

and would true dual get better gas mileage than a regular exhaust system?
It may sound better, but it wont have any noticable affect on mpg.
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Old 07-04-2009, 10:41 AM   #6
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Quote:
Originally Posted by JK4 View Post
would true dual sound better than a regular exhaust system?
The sound of an exhaust system is completely subjective. What may sound better to one person here may not sound better to another. I think this question is hard to answer. Personally, from what I've heard over the years, the more you open up the exhaust on a V6 engine, the more you realize that it's not a V8. There's simply no substitute for the exhaust note of a V8 engine with a free-flowing exhaust system. I would keep it simple, but that's just me.
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Old 07-04-2009, 05:55 PM   #7
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Quote:
Originally Posted by chris4x4 View Post
If your not going to supercharge your truck, you will loose power.
Not entirely true.

Its all dependent on pipe sizing and mufflers/cats used. True duals with a crossover will always out perform a single exhaust with a y-pipe (better scavenging when both banks are balanced) when the two systems are designed properly. Like any system the exhaust should be tuned.
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Old 07-04-2009, 06:01 PM   #8
With sufficient thrust, pigs fly just fine.
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Quote:
Originally Posted by XrunnIT View Post
Not entirely true.

Its all dependent on pipe sizing and mufflers/cats used. True duals with a crossover will always out perform a single exhaust with a y-pipe (better scavenging when both banks are balanced). Like any system the exhaust should be tuned.
I used to think the same way. We built a set up like what you are describing. Useing 2.5" pipes, on a Firebird WS6 (IIRC), and a single pipe set up, useing 3" pipe. The single made more power throughout the ROM range, and was lighter to boot. Funny thing about scavenging. Exhaust velocity plays a large roll in it. Too large a pipe, or to many pipes, and the exhaust cools down too fast, thus slowing down, and ruining scavenging. To small a pipe, and it goes too fast. There is very much a Goldie Locks affect when screwing with exhausts. And it veries engine to engine. Every "True Dual" I have seen on the Tacomas has shown a loss of power on the dyno. Unless, the engine was FI.
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Old 07-04-2009, 06:48 PM   #10
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Quote:
Originally Posted by JK4 View Post
so would adding the x-pipe or the h-pipe to the true dual exhaust give it more hp or make it louder???
An X pipe, or H pipe aids in scavenging. On a daul set up, an X pipe is prefered.
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Old 07-05-2009, 07:51 AM   #11
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Quote:
Originally Posted by chris4x4 View Post
I used to think the same way. We built a set up like what you are describing. Useing 2.5" pipes, on a Firebird WS6 (IIRC), and a single pipe set up, useing 3" pipe. The single made more power throughout the ROM range, and was lighter to boot. Funny thing about scavenging. Exhaust velocity plays a large roll in it. Too large a pipe, or to many pipes, and the exhaust cools down too fast, thus slowing down, and ruining scavenging. To small a pipe, and it goes too fast. There is very much a Goldie Locks affect when screwing with exhausts. And it veries engine to engine. Every "True Dual" I have seen on the Tacomas has shown a loss of power on the dyno. Unless, the engine was FI.
A dual 2.5" will flow more volume then a single 3". Depending on the displacement dual 2.5" could have been too much, hence the 3" outperformed the dual 2.5". Depending on the peak RPM, you may not have had enough exhaust to keep that velocity up.

Velocity = torque
Volume = peak HP

IMO torque > peak HP any day of the week. I haven't seen any numbers for true duals for the tacoma. For those JBA dual exhausts and what not, I would imagine those killed a lot of the power through the full band.

I would like to see somebody make a true dual setup using 2" pipe, and x-piped, with some straight through mufflers (for N/A with a CAI). On our 4.0L with a somewhat low peak RPM (5500 for most), I bet you would see more torque area (space below the torque line). But without being able to test it, that is just in theory.

Quote:
Originally Posted by chris4x4 View Post
An X pipe, or H pipe aids in scavenging. On a daul set up, an X pipe is prefered.
Exactly right.

X-pipe for performance, and I've read H-pipe for sound.
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Old 07-05-2009, 08:15 AM   #12
With sufficient thrust, pigs fly just fine.
chris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shed
 
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Quote:
Originally Posted by XrunnIT View Post
A dual 2.5" will flow more volume then a single 3". Depending on the displacement dual 2.5" could have been too much, hence the 3" outperformed the dual 2.5". Depending on the peak RPM, you may not have had enough exhaust to keep that velocity up.

Velocity = torque
Volume = peak HP

IMO torque > peak HP any day of the week. I haven't seen any numbers for true duals for the tacoma. For those JBA dual exhausts and what not, I would imagine those killed a lot of the power through the full band.

I would like to see somebody make a true dual setup using 2" pipe, and x-piped, with some straight through mufflers (for N/A with a CAI). On our 4.0L with a somewhat low peak RPM (5500 for most), I bet you would see more torque area (space below the torque line). But without being able to test it, that is just in theory.



Exactly right.

X-pipe for performance, and I've read H-pipe for sound.
I agree with what your saying, But keep in mind that HP is a result of Torque. H.P. = Torque x RPM / 5250. All that happens whith different exhaust set ups, is the torque curve is moved around. An ideal curve is flat from idle to rpm cut off. That would give the most power, and acceleration. In the end, scavenging playes a huge role, more so than volume of exhaust gassses pushed out the pipe.....
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