Up until a few weeks ago most of my tech knowledge dealt with my 1965 mustang but i got an 09 with the mods that i have listed in my signature. What other mods can i do to the 4.0 motor in order to increase my rwhp? I know there are a lot of things from sites to do to the gt but not that much to do to the 4.0. Just looking for some advice. Thanks

 

Right off the bat, if you're running the FRPP tune with that CAI, then a custom tune from AM or Brenspeed will yield a few more RWHP. After the CAI & tune, there's not much more other than going FI. But you can get a few more RWHP with cams & headers plus reduce driveline losses with an aluminum DS, UDP's UUnder Drive Pulleys), lighter wheels...

 

I bought it with the upgrades already done to it but the performance kit from ford racing came with a procal tool with performance calibration so i assumed that tune is what has been do to it in the respect. this is probably a dumb question but what did you mean by going FI?

 

Forced Injection

Get the rear axle regeared to 3.73 or 4.10...or grab the rear axle from a GT (higher gears and a limited slip)

You are pretty much maxed out on upping the power without going to a supercharger.

 

Actually, I have heard it as "Forced Induction"...

 

is there any way to tell what tune if any was done after the CAI was installed in my car?