Hi everyone.
I bought a Subaru Impreza S-GT with a 5MT gearbox.
Now i'm trying to generate more power from the engine but im not sure the gearbox can hold it or not. So im wondering, is there any other 5 speed gearbox can fit in? Or anything i can do to upgrade to gearbox for more power?
Because of the regulations in my country, i cannot swap a 6 speed sti gearbox on my car.
Im sorry for my poor English.
Thank you in advance.

 

You've not said what year your car is, but I believe that the later 5 speed boxes are stronger than the early ones. Early ones are TY752, then TY754 etc.
I had a TY754 in my track car and it handled 375bhp / 300ft-lb.

If you want to keep your original gearbox, PPG make internal gearsets that are much stronger than the originals.

 

Thanks for the reply.
Mine is 2008 JDM impreza S-GT GH8.
Thank you for the information.

 

Most likely a TY758VB1AA (P/N 32000AJ160)
If you want to check put the VIN or applied model code into legacypic.uk