Difference between 04-05 WRX swaybars and 04-05 STi swaybars
 

HI...i was wondering if anyone knew if there was a difference in size between the stock 04-05 swaybars for a WRX and the stock 04-05 swaybars from an STi
the same question applies for the endlinks

Also will the STi components fit onto the WRX and will it improve anything?

thanks for the help in advance!

There is a small difference in size, but more importantly the STi uses a different style of endlink and swaybar design that makes it not transferable to non-STis. However, bugeye WRXs came with a 20mm rear sway bar that fits your car. You can find them cheap used.