It's not free, but it only costs about $6-8 I think and really easy to do.

There's a little hose where you put the oil into the car (I think it went to the intake, not 100% sure - it's been awhile). Take that off and put a breather on where the oil goes in, and plug up the other end. Probably any breather will work, but mine looks like a mini air filter. Doesn't do anything for HP, but helps keep the RPMs low, especially on the interstate! Mine dropped about 200-300 RPMs throughout. [sm=smiley20.gif]

 

Another free mod to do for your gauges is this one: works on 99-04.

http://www.mustangworld.com/ourpics/fcar/dtcodes.htm

 

Dude... thats awsome. I just tried it and thats cool. I seen the video of the cobra do it but I thought that was something he put in with a flasher! Thtas bad ***!

 

Yeah I tried it today since I found it on the internet last night. It has all kinds of digital readings: MPH, tach, KMH, Engine Temp., Oil press, batt, fuel. It's awesome, the only bad thing is you have to do it everytime you start the car.