Head porting&polishing

[02wrxboost]

Hey i was wondering how much possible hp i can gain with useing stock springs and valves etc, but porting and polishing the head on my 2002 wrx(ej20)

thanks brandon

[dumdum]

Not much if you change nothing else about the car (cams,turbo,exhaust,tuning).

[02wrxboost]

well im going to run 3 inch exhaust from the cat back with a flowmaster muffler untill i can afford a better muffler and i am makeing a cold air intake for it. I am basically looking for all the little things to do untill i have the money to do the big stuff

[wrxman420]

Ditch the cold air intake, it will do more harm than good And you will not gain a lot of hp if any with a cat back exhaust. Also there are plenty of mods you can do before you start working on the engine itself, read the forums.

[psinuse]

For the love of all things holy don't use that flowmaster on your car. They are probably one of the worst mufflers to use on a turboed car. Look in to EM, plenty of room to grow and learn about your car and what makes it tick before going all out and dumping a ton of money into useless parts....