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)

 

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.

 

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.

 

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 plan on installing a flowmaster super 40” dual in dual out. The pipe diameter is going to be 2”. Will there be any hp and tq differences if I go with two mufflers instead of one? And also since I am using 2” tubing from the muffler and back should I use also 2” for the x-pipe? Thanks

 

You posted in a thread that ended in 2009.

What were you doing 8.5 years ago?

 

Do not use 2" unless you want to choke your exhaust flow.

 

Should I go with 2.25”? I see duals loosing low end with 2.5”. Thanks

 

Are you going duals, or staying single?

 

For now I think I”ll just install a spec u headers and y pipe and just change the muffler. So single for now unless I go f/i later on.