does this afe tube help at all?
 

aFe Torque Booster Tube 94-02 Dodge Cummins L6 5.9L: eBay Motors (item 300471746502 end time Oct-23-10 07:08:57 PDT)


or is it just for looks

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DIESEL_TOOLS_BMW_MERCEDES_TURBO_VW_RABBIT_VOLVO_24 0_WVO: eBay Motors (item 300282669985 end time Oct-14-10 18:21:50 PDT)

is this worth getting or a cheap piece?

Dont waste your money on the torque tube. I have one and dont like it. Its hard to get on/off when changing oil etc, and I didnt see any performance gain with it.

Compression tester looks ok. This should be ok - you really only need the adapter, hose and 1000 psi pressure guage.