Set fire to the cannon and get a real muffler. There's not really much you can do to squeeze any power out of the stock block - most people just do a turbo conversion, and that's really the best route on a Subaru.

hey man i also had a ej22 on my P plate back in the day, and the main mods i did to it were:
1: k&n pod filter cost me about $100
2: i got a custom made exhaust, it was almost a straight pipe with nice twin tips to finish it off and all this cost me about $300

then non performance parts i got it lowered and put 17inch 2003 wrx wheels on it.

Putting a $100 pod filter on an NA Subaru is roughly equivalent to putting $100 in a bin and then lighting the bin. If anything, using a pod filter will decrease performance from sucking in hot air inside the engine bay.

If you're on your P plates technically you aren't allowed to do any mods, not just a turbo conversion, so if you're concerned about legalities start saving for when you get off your Ps and buy a car that's already fast.

You might gain 0.25kw over stock.



Maybe.

hey bud i have pretty much the same car as you. im not going to do anything performance wise as im on p plates too. im gonna tint the tail lights get projectors, lower it/ get BBS rims. and chuck on an exhaust system and thats about it. oh and fix up my spoiler (some dick pulled one side off >:R
where abouts are you??

Equal length headers , 2,1/4 inch system , forget the pod , CAI and pod in front gaurd . you may see 5kw increase,