i-Club - The Ultimate Subaru Resource - which DP should i get with a 2.75" exhaust?

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which DP should i get with a 2.75" exhaust?

title explains it all. I got a STOCK 05 wagon and I just bought a used Tanabe Ultra catback and its 2.75" piping, and i just wanted to know what Down Pipe would fit? Would a full 3" DP create boost creep since it suddently goes to 2.75" ? Would i need a custom adapter section? Wouldn't that make the exhaust longer? Or will i be fine? Im so confused now. I was planning on a full 3" exhaust but didnt want to loose any low end. now i have a 2.75" catback and dont know what DP to get.. Thanx in advance for any input.

helix.....good price and quality.