The kit comes with plastic adapters at the turbo inlet bell and at the inlet and outlet of the stock MAF meter. If you don't have the adapters it won't fit correctly.
I recently had to replace the turbo inlet bell adapter on mine. I called Pete Tomka and rec'd it through him....so I know you can just buy the adapters if you bought the cold air kit used.
I'm at work now and don't have Tomka's number, but if you need it I can post it tonight.
Good Luck,
John