well im looking into getting a catless dp. and i wanted to know if a wrx pipe will fit . or is there a difference, my buddy is selling a wrx one off a 06, is there a diff?

or no..... his is manual same as my car ..
im only asking cause im a bit new to the whole turbo thing i want to make sure i get the right parts, and will i need a reducer on it to fit the stock exhaust?
any help or input would be appreciated