I have an 02 WRX and I installed SPT (Eibach) springs and it lowerd the front 1.4" and rear 1.2". Most of the companies Ive seen do lower the front more ( some more drastic than others). It makes the wheelgaps look more even unlike the factory setup with those monster gaps in front. If a drop like this is what you are looking for (if your not in a rush) get a subaru Chase platinum master card and you can get these springs for free like I did. You get 3% on purchases payable in subaru bucks. On the setup I have the front gap is still bigger but not as bad. I posted a pic on a thread called "best springs". You may want a more drastic drop in front but you will also need struts if you go anymore than 1.4".

 

the gap from the front and the back is a huge difference. if you want the car to be somewhat "balanced" with the front very low, and the back not as low....would be hard to do.

 

Coilovers would even out that gap - but they are pricey.

Tein springs have the most drastic difference between the front and rear drop - 2" rear, 0.7" front (I think)

 

I had the same problem after adding a stereo to the trunk with my Eibachs, I went with Skunk2 coilovers to even the car out.