Maybe I'm not clear on this I thought the cat was after the turbo? If so then one would believe straight pipe in place of the cat would be better to produce less backpressure? If the cat is before the turbo then it would only restrict flow if it was plugged? My bad.

__________________
It's always something simple
91 300D 603.960 (from japan) 194K
92 Toyota Diesel Landcruiser HDJ81-t 116K
02 Golf TDI new head courtesy of PO
87 300D
97 BMW 525 TDS Wagon 5spd
bunch of Onan and other diesel generators