In regards to the tranny swap it is just a bolt on affair. I have a 02 ep turbo and I recently swithed to a 6speed rsx-s tranny. Since you already have the tranny you also nee a different clutch and flywheel because the stock ones will not work.Make sure to also replace the throw out bearing. You will need to notch out the shifter ( from fifth to reverse)for the tranny to work and cut an extra slot for the new reverse to work . There are no ecu problems whatsoever so good luck .