regalis

Hallo.. I have a wrx 03-04 dont now how to see the manufacturing date on the car. The reson i post is that i want to now witch gearbox a have. Trans nr TY754VN5AA. i have herd that late03-to newer are there uppgraded gears in (wider as the RA gears and is a little stronger). so i now if a can sleeap a little better when i now have decide to go for some engine-tuning aprox 300 crank hp. Anybody now if this is the newer trans

My english spelling is mayby little wrong (but if you have trubble with it you can write back in Swedish)