So, i was recently looking on Craigslist, and i found a guy in Virginia Beach with 2 M112's. One with a stock pulley for $350, another with a 3.76 Pulley for $400. Some of you may remember me saying something about me obtaining a 3.9L for cheap with ~18k miles. Would a M112 fit on the 3.9L i looked at the guide on here and it says 3.8L or 4.2L. Also, Is that a good deal on the supercharger. I am considering picking it up this weekend if it would be a good deal, and if i don't manage to get the 3.9L would it be a bad idea to put it on a 2001 3.8 with 200K miles? or would i just bust something real quick? I am not very knowledgeable when it comes to turbos/SC's but does it effect gas mileage in a negative way? I am assuming a turbo does but im unsure about a SC. Thanks for your responses.

 

It will fit. Here are a couple video links to 3.9L with a M112 on them...

http://www.youtube.com/watch?v=EgQ6XItb44o
http://www.youtube.com/watch?v=yHjAXe5ue8o

As for what you need I found this list on another site...

And that is pretty cheap for price in my eyes. Here is a great site for just this.......

http://www.mysteedperformance.com/

 

https://mustangforums.com/forum/v6-1...tallation.html



Turbo's both help gas mileage and can take it away, when I had my T70 on the stang I was getting great mileage out of it as long as it was just cruising of course. s/c will hurt the mileage pretty much always. I also have a really good deal on that kit going on right now.

 

Mileage wont be greatly affected with a M112 as long as you stay out of boost until needed.

LilRoush stated he was getting high 20's with it.

 

Just keep in mind you will need another $2000 or so in parts.

 

These days you can find M112s in good shape for under $300 if you look.
Get a whole kit from Nathan (MySteed) if you aren't sure of stuff.
There is a TON of other stuff not listed that you'll need. It's not worth the time/energy to chase it all down.

 

Well i mean as for the fuel pump and injectors, isnt it the same as the ones stock on a cobra? I can get those for next to nothing because i work at NAPA and have a great discount program.

 

Fuel pump use the SVT Focus unit. But that's 2 things out of about 200 you need to do it right.

 

What else would i need besides what Fink has in his write up? Besides these parts

Adapter plate(available from mysteed)
90mm Lightning MAF
CAI for a 03/04 Cobra
255 or 310lph fuel pump
IAT sensor and pigtail
NGK TR6 plugs
Idler pulley and mounting hardware
Serpentine Belt
Gauges (wideband AFR, Boost)
Supercharger oil
Gaskets

 

biggest thing you still need is the adapter plate.