ok so i just changed out my up-pipe and ypipe because they both had cracked expansion joints. I put it all back together and have this hissing that I cannot pinpoint where it is coming from. It hisses at idle, and when i am building boost it gets louder but the pitch does not change. It sounds nothing like the high pitch whine i had with the cracked y-pipe. Also, there is soot all over the valley and on everything up top on the engine, above both heads. I have examined the y-pipe and up-pipe expansion joints, no soot at all. I have taken the turbo back out and reseated it just to ensure both the v clamps were flush, intercooler pipe is tight, everything. I cannot figure out where this leak is coming from. I had my buddy brake torque it while i looked and all i can see is soot coming up from around the turbo, cant pinpoint where from. Any Ideas??????