The original trap-ox and replacement catalyst look exactly the same. An untrained eye can only tell them apart by part number. The only thing they did was replace the turbo and the exchange the trap for the catalyst. It would be easy just to get rid of that large cannister and buy some sort of filter to replace it with. The large tube coming from my turbo has a small piece of PVC reducer to make it fit the filter opening.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R