l have an 02 WRX with a K&N Typhoon intake, which is my only mod so far. My next step is to get the turbo xs TBE system but l was looking at their FMIC and it says it needs a short ram intake, (such as the TXS model) to be installed, does anyone know if l will need to replace my intake, or will it fit with the one l have now? Also what does JDM?

unless u have an upgraded turbo u do not need a front mount (unless u enjoy lag & pressure drop) the top mount is fine, & if u upgrade to an ST l one it will be good for 300hp easy, for less than half the cost. Simply having a bigger intercooler will not add HP, without proper supporting mods ur performance will actually suffer.
The same basically goes for the TBE as well, without a tune of some sort u will see virtually no gains with our cars. My advice is instead of wasting money on a FMIC u do not need. Buy the full exhaust AND a Cobb AcessPort (used can be had for $300-500), flash ur ECU to stage 2 & enjoy ur 260-270 crank HP.

A very good forum for info (you should be a part of before u start doing any mods) is Nasioc.com. Check it out & start researching.

btw: JDM simply means Japanese Domestic Market, parts usually demand a premium cost, but does not mean it is necessarily better.