I have a 1993 ej22 Legacy. I decided to have the heads ported and new valve and heavier valve springs installed to add 30 to 40 horsepower. Keeping the cam the stock one due to legally being able to race in this class. Just wondering if anyone else has done this and what kind of power they improved. And if there any other modification I can do to add horsepower.

Those modifications will do very little. The engine is already making 135 HP and even dramatically improving the volumetric efficiency and moving the peak HP up to 7000 RPM would probably only yield about 150 HP. This would of course require replacing the cam. Since you can't do that, and you can't increase the redline without a completely different management system, you're not going to get even half that much of a gain. You will be lucky to gain 5 HP for all that trouble and as much as you may like to think you can feel 5 HP. You can't. 

 

GD

Sorry, but these cars were never intended to be "performance" cars, and there is very little you can do to make it one, short of swapping in a different engine, which opens up a whole different can of worms.

 

If you want a "performance" car, buy a performance car... the WRX STI would probably be more appropriate...

We used to have a 1/8 th mile high bank dirt track just down the road.  I took an early 80's 4wd hatchback and ran the ea18 engine in the fever four class. I rarely won but I could hit those high banks rite at the bottom and blow by all the 2.5 ford motors ... who would promptly blow rite by me as soon as they hit the straightaway. It was great fun and a bottomless black hole for $ .... Just before they shut down the track I had acquired a early 2.2 & a 2wd auto trans for it . Had to modify the intake to use a 500 cfm holley carb . Used a Mitsubishi points distributor on the back of the head.... home made headers, it was quite the set up . Sadly they shut down the track before I got all the bugs worked out.  Everybody is correct these just are not high performance motors until you step up to the wrx/sti .   Good luck on the track keep the rubber side down.    

I put nitrous in mine, 75 wet shot. Really woke it up. Did a writeup a few years back