2003 wrx build

[jordannn1233]

Hi I have a 2003 Wrx with nothing other than a AEM cold air intake. I was thinking to make my car like a sleeper to take a wrecked 2012 STI and put the motor and transmission into my car if it would fit. Does anyone have an opinion on this? Especially because the horsepower is going to be a big increase and then I can mod it after this is done and make it faster.

[lino129]

I believe its going to be hella hard to fit that tranny in a bug, the hawkeye(06-07 STi) trannys fit with minimal parts needed.
06-07 sti 6speed (obviously)
driveshaft from a automatic impreza
you can reuse your clutch and flywheel, but why not get new ones that are STI spec?

as far as I know thats it (and obviously a 6 speed shift knob)
looking into doing it for my bug one day....

[SD_GR]

Do you have a wrecked 2012?

[jordannn1233]

not yet ive found a couple but if you know of anywhere that i can find one any help would be nice.

[jordannn1233]

thanx sounds like it could be a fun project

[dinggoo]

Why the 2012 sti motor instead of an earlier year

[zax]

Odd. If you're looking for the horsepower bump I suggest modifying your current motor. Unless your motor is toast or >320whp there is still a lot of potential left. Also you will need a new ECU and harness.

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[T0rque]

I believe its going to be hella hard to fit that tranny in a bug, the hawkeye(06-07 STi) trannys fit with minimal parts needed.
06-07 sti 6speed (obviously)
driveshaft from a automatic impreza
you can reuse your clutch and flywheel, but why not get new ones that are STI spec?

as far as I know thats it (and obviously a 6 speed shift knob)
looking into doing it for my bug one day....

Not even close champ.. Sorry man.. 6 speed trans swap:

Rear hubs/brake conversion and wheels
axles front and rear
rear diff
6 speed trans
clutch
flywheel
some way of controlling the dccd

[zax]

Not even close champ.. Sorry man.. 6 speed trans swap:

Rear hubs/brake conversion and wheels
axles front and rear
rear diff
6 speed trans
clutch
flywheel
some way of controlling the dccd

At minimum with a 2006 STi 6MT, you'll need:
Transmission (front and center diff are inside transmission!)
Clutch/Flywheel/Shift Linkage
Front Axles and knuckle
4EAT driveshaft

For this year the rear diff isn't a necessary swap. 2006/2007 WRX require a rear diff thanks to the 3.7:1 transmission final drive. Also, one does not require a DCCD controller, since the center Diff will default to a 43/57 front/rear split (for the 2008+ 47/53) mechanically... still why would you not wire in a DCCD controller to harness the full power of the STi transmission?

[lino129]

I know people who have done it the way I said (yes I forgot the DCCD controller), and shifter linkage. but he did nothing to the hubs, axles, brakes or wheels...

[T0rque]

It's been a long time since I personally did it but lots of things have changed now obviously people know the driveshaft works without modification and all that.. I did it back in 2007 so things have changed.

Still need to change the clutch/flywheel tho.. But why wouldn't you anyway

[lino129]

Ahh, theres a guy who just got done doing it on NASIOC. he said it only worked that way for the 06 tranny. but the people at flatironstuning.com sell a package for it using a 07 tranny. all you need to provide is the driveshaft, and clutch/flywheel. because you CAN use wrx clutch/flywheel, but yea I agree, why would you get the STi spec one?

[zax]

Ahh, theres a guy who just got done doing it on NASIOC. he said it only worked that way for the 06 tranny

At minimum with a 2006 STi 6MT, you'll need:

[lino129]

Yea yea I know. but you said he would need the axles and knuckles, which he didn't... idk I'm just saying what I know, could be wrong. lol :P

[T0rque]

The 6 speed clutch/flywheel is different then the 5 speed clutch and flywheel. You can use the 5 speed clutch and flywheel but the surface area is less and wouldnt be as efficient with the 6 speed and in reality why the **** would you use the 5 speed. Its a bitch to pull the trans without a lift, why do it twice to be cheap 1 month.

Also if you ever revert back to the 5 speed the 6 speed clutch/flywheel will not work with the 5 speed, unless you machine the bell housing.

Good luck whichever way you go.