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I installed a number of those kits back in the day, had one on my car for a couple years, still have the kit in boxes.
The manifolds were good for the time, but Pentroof made much better long tube manifolds that actually held up. Running much boost, the Greddy manifolds crack very quickly.
The Greddy kit came with modified stock turbo inlet pipes, they necked down to the turbo's 2 inch opening on the suction side making the inlet pipes smaller than stock connecting to the turbos.
They came with accordion replacement pipes that were a metric size that was slightly larger than 2.25" OD.
The turbo outlets were 1 3/4", the turbo outlet pipes were also modified stock pipes that started at 1 3/4" and bumped up to 2 inch, they came with some replacement intercooler pipes, but they were all 2 inch like stock.
The kit did come with external wastegates, but they were very poor quality and failed quickly.
After seeing the first kit, I went out and bought one, but I regretted it quickly and changed out the kit and prefer Garrett turbos.Here are some pictures...
Greddy pipes silver
Dirty black are stock
shinny black is 2.5 Ash
 Here you can see the that Greddy simply used a factory turbo inlet and welded on a smaller 1 3/4" hose connection.
Not even a taper, just blunt change. 
Here is the greddy outlets compaired to stock and our outlet.
stock outlet black dirty
Greddy Silver
Shinny SZ taper outlet going from 2" to 2.5" 
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Many in-correct statements..... - 
