2004 pt cruiser rs

You can use a xk531 combo dei unt or a chdl3-pk also dei.  You can also a 555c to bypass the chip in the key and a 451m relay to control the door locks thats what I use all the time,  Some people have a hard time with the 555c you can use a 556u but you will have to give up a key.

try www.idatalink.com they have great stuff

www.xpresskit.com for the dei stuff

hope this helps

fcss is correct,  I use the 555c and 451m all the time but we use flash logic module which is made by  idatalink the unit we use is a FLCAN it does alot of features but you need another module call a FLR1 that for the chip. I dont like the FLR1 to much but thats just me.  I use and like the 555c better or a 556u instead which is very easy to use.

www.flash-it.com

good luck