Today I looked at the front sway bar on my 04 FXT and compared to my friend's 06 sti as far as I can tell they look the same. The diameter is the same does anyone know what's the differences between these two?
I'm fairly certain the WRX bar is 19mm. I know FXT is same shape and size as the '04-'06 USDM STi and is either 19mm or 21mm -- in either case, it's too small :icon_biggrin:. Stock WRX and STi front bars are shaped differently. I have my stock FSB somewhere, I could find it and measure it.. but it would take me time to find it.
Are you looking at using OEM Impreza bar as an upgrade? If so, it's not an upgrade. If you are looking for an afermarket FSB of Impreza fitment, things get more complicated since some bars will fit both the WRX and STi, and some will fit one but not the other. As a rough reference, check out Oakos' STi FSB listing.
the sg bars (same fitment as later gd) won't work on the sf. i used to have the i-STi whiteline bars for my past 06 fxt. they never fit my sf. for the rears, it's too much of a stretch. go by the endlinks - if you have the c-shaped links, you'll have to use either a gc rsb or earlier gd (non-STi) rsb.