Hey man I'm new to the club and to the wrx and I have some stuff to read for you if you have some time. I just want to know what you think because I also have the 09 WRX but its the 265 sedan. I rushed into the K&N cold air like many people do, I just found out that I have to take it off to run the cobb tune. I have a borla catback, bought that not knowing they didn't make a down pipe. I am looking to a perrin down pipe right now, they are telling me its going to fit the borla no problem. Should I go with the two piece or one? What is the advantage of two cats, will it be quieter or something? I don't want it to loud, thats why I like the borla, its not so loud. How do you find your volume on long trips? Are there other down pipes you would recomend? Anyway I want a down pipe and a tune, should be at about 300hp. What do you think?