This is what mine was looking like with a bad M370 install on a dynojet with an overlay of the existing exhaust mods

http://www.the370z.com/attachments/i...-m370-dyno.jpg

This is the graph of what it looked like just before the stock manifold and all listed mods on my sig.

http://www.the370z.com/attachments/i...ifold-dyno.jpg

This is nearly a 100 whp difference from one mod incorrectly installed.



This is the video of what it sounded like.

Very nice sound. I will reinstall it this weekend. I did order the invidia yest pipe and I will get them also this weekend. Thanks guys and I will be posting what will happen with me :)

As soon as I installed my M370 I could instantly tell a good power boost in the mid range. Even as low as 3000rpms. The only reason you might experience a decrease in power down low is if you have an automatic trans or if your install was not proformed correctly. My car was not tuned and only had some simple mods done at the time I installed my intake manifold.

I'm Not sure. The shop installed the manifold for me is a good tuning shop, but mistake might happen. And yes my car is Auto. Could the vacum installed incorrectly?
because I saw the mechanic did a two T joints?

If your vacuum lines are not connected your performance will suffer. You do have to use T connections when installing the M370 which is fine as long as there are no leaks or disconnected vacuum sources. I have a 7AT and had no power loss at low end. Actually the torque felt stronger.

The sound in the video is what bad sounds like even though it sounded cool

I will check the vacuum lines because I called Motordyne and sent me the installation notes. In the manual they connected only One T joints and in my car they did Two.
I will try to fix it this weekend. But my uprev appointment will be next Thursday.

Guy,
I took a picture Of the connection behind the Intake manifold. Could it be the problem ?
Thanks
http://imageshack.us/photo/my-images...70problem.jpg/

<a target='_blank' title='ImageShack - Image And Video Hosting' href='http://imageshack.us/photo/my-images/98/m370problem.jpg/'><img src='http://img98.imageshack.us/img98/6678/m370problem.jpg' border='0'/></a><br>Uploaded with <a target='_blank' href='http://imageshack.us'>ImageShack.us</a>

Sorry guys, I dont know how to post a pic direct :(
ImageShack® - Online Photo and Video Hosting

Those T connections look fine as long as they're not leaking

I guess this time I will get it right :)
Do you think the problem chould be this (two T Joints) ?
I marked them 1 & 2


http://img21.imageshack.us/img21/667...problem.th.jpg

No they are not leaking. But In the manual that I got from Motordyne they only have 1 T joints. could it be more than one way to install.
Sorry guys I don't know too much about mechanics. :'''(

In the manual, do they run a second T joint at the front side of the intake manifold? I believe Tony made a configuration change to the hose layout on the later kits.

You should have (1) T in the rear of the manifold and (1) in the front which is is pictured below.

http://www.the370z.com/attachment.ph...1&d=1342306651

Since there is no vacuum port on the front of the M370 manifold, the "T" connection in the rear provides a port to connct a hose to run to the front of the manifold. The second "T" connection is used in the front to connect the hoses at the front going to each valve cover for PCV (positive crankcase ventilation). Other than that, the other connections are the same as the stock manifold. The instruction sheets are correct.

If you have 2 T's in the front, there is somer sort of redundancy that can and should be removed for simplicity. Try drawing it out on paper and make sure it make sense.