EJ20 vs. EJ25

[wolfracing]

Can any one tell me what can be interchanged with EJ20 and EJ25 I can not find this info any where?

[blacktalon9]

Not much is the same, but some things can be used. The heads are different. STI heads have different cams and AVCS. EJ20 heads can be bolted on a EJ25 or vice versa. The pistons are obviously different. The 25's are a wider diameter. I believe the wrist pins are the same. The STI ej25 has a vf39 turbo... the WRX has a TDO4.... the STI turbo can be bolted on the wrx for more power. The STI up pipe will directly bolt into the EJ20. The WRX has a cataletic converter in the up pipe which is a bad thing... the cranks are different and you must change your rods to use then in one block or the other... what else do you wanna know?

[blacktalon9]

The intercooler on the STI is larger but will work on the WRX. The US STI injectors will not work on a WRX. They are side feed. The japanese STI's have 2.0 engines in them and have injectors that will work in the WRX. They are called STI "pinks."

[mosc]

the STi intercooler has a slightly different angle than the 02-05 WRX's. It fits, you just have to be aware of that and adjust things accordingly. I think the 06-07 use the same position of the IC on STI and WRX...

[b7g]

Originally Posted by wolfracing

Can any one tell me what can be interchanged with EJ20 and EJ25 I can not find this info any where?

Do you mean an ej 205 and ej 255, wrx motors? If so, then basically nothing but displacement. However I think an 04/05 Forester motor is the same as ej257 sti's.

But if you thinking of hybridizing 205 and 255, i am not sure on which head gasket to use...
maybe someone does...

[baller_v24]

i think the throttle body too, not sure though. i dont know about the intake manifold.

[wolfracing]

I am look at like oil pan pick up and pump