As per the title. Will this offset on 18" fit the 03 STI

 

Yes. I have 18" ET51 PFF7s on my 03STi with 225/40/18 F1s no prob at all, thats what they were designed for. Gold 17s are ET53 so not much in it anyway.

Also have TD pro race 1.2s ET45 with R888s and these rubbed rubber strip on rear arches so I removed the strip then all was OK.

 

Thanks D1ccy