Can i fit a wrx engine into a 2,0 ltr wagon

There's several ways to improve engine performance.
You can change internal engine parts(crankshaft, camshaft, piston, rods, valves, gasket,block) the air intake(filter, piping) the exhaust, turbocharging (although i don't know how good it would be since it is an aspirated engine) and there are more.
This is something that requires money, time and expertise.
You can do some of the modifications by yourself, you can start by upgrading your air intake, but other modifications require engineering expertise to be sure what the engine can still handle and how can it be upgraded.

Body parts yes, but not all engine part are interchangable.

hi the version 3 have a slightly diff loom and ignitor setup so it will if you swap the intake manifolds and looms over

You say you changed your spark plugs. Is it possible you crossed your wires. Check and see. Good Luck Friend.

This information is from my genuine service manual. I hope it is of help.
Non-turbo
Turbo
Sedan Wagon
Type 5-forward speeds with synchromesh and 1-reverse
Transmission gear ratio
1st 3.454 3.454
2nd 2.062 1.947
3rd 1.448 1.366
4th 1.088 0.972
5th 0.780 0.738
Reverse 3.333
Front reduction gear Final
Type of gear Hypoid
Gear ratio 4.111 3.900
Rear reduction gear
Transfer
Type of gear Helical
Gear ratio 1.000 1.100
Final
Type of gear Hypoid
Gear ratio 4.111 3.900 3.545
Front differential Type and number of gear Straight bevel gear (Bevel pinion: 2, Bevel gear: 2)
Center differential Type and number of gear
Straight bevel gear
(Bevel pinion: 2, Bevel gear: 2 and viscous coupling)
Transmission gear oil GL-5
Transmission gear oil capacity 3.5 2 (3.7 US qt, 3.1 Imp qt)

a c-clamp to compress the caliper piston and a set of metric wrenches to remove the caliper.that's it.

i believe the engines for those were the same in the pick up trucks from 96 to the beginning of 99 and from 96 to 2000 for the tahoe and suburbans,the 5.0 ltr and the 5.7 ltr,hope this helps

are you sure you do not have a wrx-sti??? an H7 is the low beam bulb for a non sti......an sti has a different bulb. D2S. HID lighting.

the 1.9 stopped being offered in 1996. it is very possible that your engine came from a later model run 96 or early model run 97.

but regardless the electronics are different and the engine will not run. sorry

you should already have a wire shunt in the main harness for the tach. all you need is the sending unit and the gauge. the sending unit goes in a port on top of the transmission next to the engin bloc. the dealer ship will have the schematic for your specific vehicle and the right sending unit............please rate this