Originally Posted by Swagon_Wagon
but if you want. you could open up all sorts of possibiltys with standalone engine management. uel heads with 2.5" back to a can. short ram intake. spark and fuel upgrades. and most important, hybrid builds. the 22e head on a 25 block is common. If 2.0 heads would fit and work idk maybe try it.
What possibilities? 10whp?
If I were you, I'd spend as little as possible. Headgaskets and a timing-belt/water pump would only cost you a few hundred bucks if you can do the labor yourself or with your friend for a case of beer.
I wouldn't waste my time trying to build a high-power N/A. Anything, ANYTHING, you try to do to make more power out of an N/A will have a TERRIBLE ROI. There are people who have spent THOUSANDS, and make less power than a stock EJ20 WRX.
If you HAVE to spend the rest, invest in tires, brakes, suspension (in that order).
Otherwise save your money.
An EG33 swap is definitely possible, but you'll be asking a LOT of your friend. It's not a bolt-in-and-drive swap.