[IMPREZA 2.5 WRX]

Hey i need a little help. I have a 98 2.5 rs. I'm looking to do a wrx ej20 motor and tranny swap. I know quite a bit but the question I have is the gear ratio in the wrx rear diff. the same as my rs. I need to know this so I know if i have to change my rear diff. to use the beefier wrx tranny. Thanks for everyone's time in advance.

 

[joubtt]

They've Done It

http://www.i-speedusa.com/home/

 

[DanzBorin]

The gear ratio is much different in the WRX... The gears are much taller... It will feel quite a bit different... and yes, you will need a new dif... but that will be good b/c it will be a limited slip...

 

[IMPREZA 2.5 WRX]

Hey thaks for the advice guys i have another question. Does anyone know if the JDM ecu use Obd II. The emissions stations now plug into your cars ecu and search for trouble codes so if the jdm ecu don't then i will have to find a new solution. Also does anyone know if it would pass this test if I were to use a stand alone management system.