What are my backbox options? (R45)

I want a bit more of a free flowing backbox. I've read about that the 160 boxes will fit on but not on a diesel as they are 3 bolt flanges?



Mufflerrectomy is tempting too...



Don't need stainless as i want it to be a cheap mod. Bit more turbo noise and less restrictive back box.



any links/suggestions?

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