2006 V6 Long Tube Headers


Hello All,

Looking for advice. I currently have an 06 Ford Mustang V6 Fastback Coupe with a 5 speed manual transmission. My Mustang was purchased with the “Premium” trim package, and the “Sport” trim package. I have already had several modifications/upgrades installed including Airaid Cold Air Intake (CAI) - SynthaMax Dry Filter, and the Pypes Mid-Muffler True Dual Exhaust.

I have had the Pypes Mid Muffler True Duel Exhaust installed for several years, and over time it has started to rattle a bit, so I am currently looking to get rid of the rattle, and possibly improve overall performance, and make the exhaust sound better.

After giving it a little thought, and doing a bit of research, I think I would like to install a set of long tube headers, keeping in mind that this is my daily driver, and as it is my daily driver, I cannot use any “off road” mid pipe that will eliminate my CAT’s, or have a setup that causes fault codes. I cannot pass emissions testing if I have fault codes. So, before I rush out and purchase a new set of long tube headers, I would like to determine exactly what parts I will need.

With that said, here is the setup I am looking at:

(x1) Kooks 1-5/8 in. x 2.5 in. Stainless Steel Long Tube Headers (Item # 11332000)
(x1) Kooks 2 1/2" Catted H Pipe (Item # 11313500)
(x2) Kooks High Flow Race Cats (These should be included with the H Pipe)
(x1) SR Performance O2 Sensor Extension Kit – Pair (Item # 56013)
(x1) Long Tube Header Installation (This will be sourced from a local shop)
(x1) Custom Tune for the addition of Long Tube Headers

Here are my questions/concerns:

I am not sure if the mufflers included as part of the Pypes Mid-Muffler True Dual Exhaust will need to be replaced or relocated?

I believe that the existing Pypes Mid-Muffler True Dual Exhaust utilizes 2-1/2” stainless steel exhaust pipe, so this should be compatible with the Kooks catted H pipe?

I am not sure if I will need any additional parts?

Any help would be appreciated!!

Thanks in advance!



Profile Violation
You do not want TRUE duals, you want an "X" or "H" pipe for exhaust gas
scavenging, more so, the "X" pipe. You're going with the "H" pipe, so

You will need the hangers on the other side, and on the other side of the
transmission mount.

There is no "sport" trim package, for V6, it's Standard, Deluxe or Premium.
GT is Deluxe or Premium.
No SPORT... If someone told you sport, or sold it as such, they're
making stuff up.

TRUE duals are actually separate piping for each bank, with no crossover
pipe, FYI... Like, when you put Vance Hines pipes in on a Harley or other
bike, there is no crossover pipe between the two. Each jug has it's own
pipe... Same with cars, technically. The "X" pipe helps scavenge exhaust
gases out of the cylinders.


Thanks 08 Mustang Dude!

I was looking for some insight/advise, and sincerely appreciate your response. As I mentioned, I had the True Duel Exhaust installed a couple of years ago. The main reason that I even mentioned the True Duel exhaust was because installing the True Duel Exhaust removed the stock “Y Pipe”, and replaced it with an “X Pipe”, and relocated the mufflers from the stock location at tail end of the car, to a location closer to the middle of the car. Also, the True Duel Exhaust also included the additional exhaust piping running from the CAT back to the tail end of the car on the driver’s side, including hangers.

What I am wanting to do now is install Long Tube Headers. In researching the subject online, there does not seem to be a great deal of information available that I can find regarding a setup for Long Tube Headers on a V6, so I was hoping that there may be another member of this forum who had installed Long Tube Headers on their V6 Mustang, and could offer a little insight, and maybe additional information regarding the parts they used.

And while it was not the intent of my post, if you look down toward the bottom of the “Cars.com” page that you linked, you will see that there is indeed a “Sport Package”, in fact there are (x2) of them, an “Interior Sport Package” and an “Exterior Sport Package”.


Profile Violation
The difference with long tube headers, is it changes the torque range.
People don't know that Long Tube headers are really for high rev motors.

Short tube headers are for more low to mid range power in reference to your
rpm band. These are daily driver headers, or for trucks if towing.

Long Tube:
They allow for more top end exhaust gas flow. The long tubes keep exhaust
gasses separate from each cylinder for a much longer period of time. They
typically eliminate emissions equipment. They are a better option if you plan
on racing and pushing your car to redline all the time, looking to produce
greater peak horsepower and don’t have to worry about complying with
emissions standards.

Lots of sites that sell them have a disclaimer:
This is a Race Only product that is to be used solely for competition. It cannot be used on
vehicles that are operated on public streets, roads or highways. Its use is limited to
closed-course and open-course racing that is formally sanctioned by a recognized racing
organization. Any other use, including recreational off-road use, could be in violation of
local, state and federal laws. Shipping Restriction: CA, NY, ME.

There's no reason to put long tubes on a V6, it's not a hi-rev engine, nor is it
a particularly powerful engine. My 3.5 V6 Charger was 250 HP, and they're only
pushing 210 from this 4.0? Long tubes would be good for the Roadrunner 5.0

Anyhow, here is a video on before and after, a V6 with Long Tube, single exhaust.
You can see the exhaust gases you see coming from the tailpipe you did not see in
the BEFORE portion, thus there are no CATs on the car:

There is another video, but it was for a supercharged V6...
Might help with some installation information...

Do not wrap the headers, it will void the warranty. The wrap traps moisture, and will
deteriorate the headers. Kooks and PaceSetter both state that...
Will not warranty any exhaust product that has been improperly installed, crashed, welded,
or modified (coatings, header wraps, etc) in any way.

Also, Sport APPEARANCE, is not SPORT... I don't consider my car a SPORT model
because the steering wheel is wrapped..