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There is also Bauedesert that make a good system albeit for the patrol they recommend a 2.75"
What I can recommend is find an exhaust supplier that gives you a mandrel bent system as this gives you a uniformed diameter from front to back.
Get a system that bolts immediately to the back of the turbo dump, not after it.
Get a system that already has an EGT bung welded I to the dump pipe, that way you do not have to then take it somewhere to get it retro fitted after you put it in.