Need buying advice for mod'd jdm sti
 

Hi all, I'm looking to buy a modified jdm sti my02-04 and wondered what I should look out for:
kind of smoke on startup, noises, where are chassis numbers, engine number, what to look for with dccd etc etc

I already have an 04 wrx ppp, but I bought that from a dealer and am now bored with it. seems way cheaper to buy a modded car than try to mod my own.