I know its been asked a million times before - should really have a section for it where people can look it up.

I know the website that i've used before is something like kimandmike or something. If someone could point me in the right direction

 

Which Car is a WRX STi

 

Id take whats written there with a pinch of salt.

 

Page has been around for years and I think it's accurate.

The other pages are
Steve's Eta Tauri Site - UK Model codes
Eta Tauri Site Impreza Reference - WRX Frenzy

 

Better to look on the SIDC FAQ page. Its not the chassis number though, its the applied model number.