The only cons I can think of is the space, hardly any to work on the car, like he said, you might as well take everything off. But the basic changes, alternator, ac compressor, are really easy to do.

The engine is great, balanced is perfect and the configuration of the engine and transmission is awesome. It's mounted like a V8 kind of, the only thing is weak parts on the WRX. If they where built stronger, or if we build them stronger they would be one of the best 4cyl engines to modify.

Just look at the JDM Sti engines, they can hold insane amounts of boost and will run perfect. The USDM Sti is also a great example of a well built engine/car. The WRX I believe was never thought of being so big, and that is why is was like a test car for the possible introduction of the Sti, and I'm glad they did being them over.