This is how I installed an aftermarket Mustang 2v plenum on my '05, I am pretty confident it can be improved upon but this is a start.
What you will need to do it this way:
- New plenum(duh)
- hose clamps(4 will be enough)
- 1 1/2 feet of 3/8" vacuum hose or other hose that will hold up(I used fuel line)
- 1 1/2 feet of 1/2" vacuum hose or other hose that will hold up(I used fuel line), I tried heater hose and it just collapsed under vacuum.
- Heat gun(to remove factory connectors from hoses)

If you look at the '05+ stock plenum you'll see it's basically the same as earlier models except that the throttle cable mount isn't tapped and the same for the IAC valve mount, it's also not drilled through.



So I went and picked up an Accufab plenum and looked at it, didn't take long to figure out what I was going to do if it would work.


The connection for the PCV hose is a tube that's the same size as the opening for the IAC valve. The only hard part was getting the PCV connector out of the old plenum, PB plaster allowed it to basically twist out.

I removed the PCV connector from my old plenum and fastened it to the Accufab plenum in the IAC port.

This is the original PCV hose which will not reach the new location on the opposite side of the plenum, you will need those connectors though. I used a heat gun to warm the ends and the connectors were able to be pulled out.

The front side of the Accufab(and other Mustang plenums) has one vacuum connection that I just turned around and used for the vacuum lines going into the EGR valve.


The backside(windshield side) of the plenum has 2 vacuum ports that match up with the ones on the original(brake booster and EVAP purge valve). I had to lengthen the line for the EVAP purge valve so I used 3/8" fuel line and the factory connector for attaching to the valve(a hose clamp holding the hose and the connector together), a hose clamp on the plenum. The clip on the plenum end of the factory hose will be extra since it doesn't clip onto the new plenum.

For the PCV vacuum connection, I used 1/2" fuel line and the 2 factory connectors, the connectors are held by hose clamps just to make sure they don't come apart.

Front side installed:

EGR vacuum connections:

Back side:



It was a good compliment to the 75mm BBK TB I put on earlier this year.

Nice work! Did you notice a gain?

As I said before. You did a good job

This was done right after the cams so I was still getting used to that.

I haven't been on here for a while, so please excuse my ignorance: How on earth did you manage to install a mechanical throttle body on a dbw engine?

He didn't , just the Plenum. You can see the dbw tb in the pics.

Good job. One thing I did differently, not that you did it wrong. Was cut the stock pcv tube up and use the performed bends with some hose in between. This way its not so loopy. My 08 has a 90* fitting on the valve so the hose doesn't come straight up.

good job man
I'm sure now tons of people are going the same route as you for the dbw cars

Great write up!!! I'm debating between the Accufab and C&L. Accufab has done a little better in dyno tests, but the C&L has the advantages of being $100 cheaper and not having any writing on top. Any intake with writing on top will end up backwards on a Panther.

The Accufab sure is shiny and pretty though

It stands out since it's the only shiny thing under my hood too

Any plenum made for the 4.6L 2V Mustang should work but some may need spacers under(I think the C&L is one of them)

I got the Accufab on Corral so it wasn't full price

very cool!

You could always put a 4.6L nitrous spray plate as your "spacer" haha

Like the plate that comes in kit 20946-10 from Nitrous Express? *Big stupid grin* I have no idea what you are talking about.

Unfortunately, that is yet another item that falls into my long list of parts to "gather." Parts were easier to buy before wife, kid, house, etc.

LOL Times eleventy billion!!

Truer words have NEVER been spoken EVER!!!!

I have the C&L, you need to trim the crash bracket. The EGR bolts right up.