(Down or UP pipe not to sure)
Hey guys, been having a boost problem for a little while now with my 01 wrx, symptoms are: I hear a 'fluttering' air-charging sound when in boost, boost isn't as strong and my exhaust makes a fluttering sound while idling. (also just had to replace my o2 sensor) I have a upgraded turbo-vf28, sti tmic, as well as a 3" turbo back exhuast. I am pretty new to all this stuff soo not to sure what im really talking about. But!..

Late last night while having a study break i went out to have a look around my engine bay to see if i could spot any obvious vacuum or pipe leaks.. and spotted this sucka:






It's the pipe coming straight down from my turbo..so I'm guessing this is a DOWN or UP -pipe? just wanted to get some info about what it is and does etc.. and how this hole can affect my car, and how to go about fixing it ><

Thanks heaps guys!

(Btw anyone going to that Luke Beyer's cruise?)