This is old info but thanks for the repost, being on this forum so long as you have almost been all these get lost in the archives!!
Anyway to prevent any of this at all cost when buying an STi (v8) tmic always try and get the stock y-pipe with it. Also it always good to get all stock nuts, bolts, etc.. when buying a product.
Luckily I was fortunate enough to make a trade deal when I bought my STi tmic. The guy who sold me his fortunately went with the bigger tmic and not fmic and needed my samco hoses so we sort of traded and I only paid 50 bucks for mine.