on swapping out the boxer 4 for the boxer 4 found on the wrx
i just got the car a few days ago but already im wondering, what would make it possible to swap the saabs boxer 4 for a wrx's boxer 4. what would i need to do to make this all possible

Based on the Subaru Impreza and Impreza WRX wagons, the Saab 9-2X receives minor changes for its second and last year in production. The base version, formerly the Linear, was renamed the 2.5i, reflecting its 2.5-liter engine, which gets an 8-hp boost to 173 hp. The high-performance Aero gets a 3-hp boost to 230 hp.
Both models come standard with four-wheel disc ABS with brake assist and electronic brakeforce distribution, along with Subaru's well-developed AWD system. Standard advanced safety equipment includes side-impact airbags and active head restraints. The National Highway Traffic Safety Administration rated the 9-2X four out of five stars on all crash tests, except for the frontal crash test for passengers only, in which it earned five stars.
Performance for the Aero focuses on Saab's retuning of the Subaru suspension, which results in better handling than the WRX wagon's. And the addition of the Subaru STI's rally-bred steering rack gives the Aero fast and precise steering. Acceleration, due to the extra weight of sound-deadening material and the addition of various upscale interior materials, slows about a second compared to the WRX, but the Aero is still plenty fast at 6.1 seconds for 0-60 mph. And overall, the Aero's ride is more compliant than a WRX's. Some reviewers, though they found the ride in the Aero more punishing than that of the base model 2.5i, enjoyed the Aero's more spirited handling.
Some criticized Saab's price point on the 9-2X, pointing out that its competitors in this premium compact car segment, such as the MINI, Acura RSX, and even the Subaru Impreza, offer lower starting price points. Also drawing criticism were the lack of rear-seat legroom and narrow rear door openings. Gas mileage for the Aero is rated at 20/26 mpg city/highway with premium fuel.
i just got the car a few days ago but already im wondering, what would make it possible to swap the saabs boxer 4 for a wrx's boxer 4. what would i need to do to make this all possible
Airbags
Dual front airbags · Front side airbags
Audio System
Single disc in-Dash CD · AM/FM radio
Brakes
ABS: 4-wheel · Front brakes: ventilated disc · Rear brakes: disc
Comfort Features
Door trim: leather · Floor Mat Material: carpet · Floor Mats: front · Shift knob trim: leather · Steering wheel trim: leather
Convenience Features
Center console: front console with storage · Multi-function remote: keyless entry · Reading lights: front · Steering wheel: tilt-adjustable · Storage: door pockets
Driver Seat
Manual adjustments: 8
Drivetrain
Limited slip differential: center
Headrests
Front headrests: adjustable
Instrumentation
Warnings and reminders: low fuel level
Mirrors
Exterior mirrors: power
Rear Seats
Type: bench
Roof
Sunroof: power glass
Safety
Active head restraints: driver
Seatbelts
Rear center seatbelt: 3-point
Seats
Driver seat manual adjustments: height · Front seat type: sport bucket · Rear seat folding: split · Upholstery: cloth
Spare Tire
Mount Location: inside
Suspension
Front Suspension Classification: independent · Front Suspension Type: MacPherson struts · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): rear
Tires
Type: all season
Windows
Front wipers: intermittent
Air Conditioning
Automatic climate control front air conditioning
Airbags
Dual front airbags · Front side airbags
Audio System
6 disc in-dash CD · MP3 player: CD MP3 Playback · AM/FM radio
Brakes
ABS: 4-wheel · Front brakes: ventilated disc · Rear brakes: disc
Comfort Features
Door trim: leather · Floor Mat Material: carpet · Floor Mats: front · Shift knob trim: leather · Steering wheel trim: leather
Convenience Features
Center console: front console with storage · Multi-function remote: keyless entry · Reading lights: front · Steering wheel: tilt-adjustable · Storage: cargo tie-down anchors and hooks
Driver Seat
Manual adjustments: 8
Drivetrain
Limited slip differential: center
Headrests
Front headrests: adjustable
Instrumentation
Warnings and reminders: low fuel level
Lights
Headlights: Xenon
Mirrors
Exterior mirrors: power
Rear Seats
Type: bench
Roof
Sunroof: power glass
Safety
Active head restraints: driver
Seatbelts
Rear center seatbelt: 3-point
Seats
Driver seat manual adjustments: height · Front seat type: sport bucket · Rear seat folding: split · Upholstery: leather
Spare Tire
Mount Location: inside
Suspension
Front Suspension Classification: independent · Front Suspension Type: MacPherson struts · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): rear
Tires
Type: all season
Tires and Rims
Wheels: alloy
Windows
Front wipers: intermittent