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Just reading another thread and people are shocked with the price of replacement Cats from BMW. I was too so I did this!
I've just fitted new Cats on my 850csi. I cut the Cats open at the weld on one end and removed/knocked out the Cat insides leaving the Cat cans empty. I then welded (stainless) Magnaflow Freeflow/Race Cats inside the empty cans, they are a snug fit. Then reweld the end back on. You would never know they'd been split open. Exhaust still looks standard. Just passed the MOT. Total cost for both Cats under £300. I'm thinking about doing the same on my M5 Elekta
I've just fitted new Cats on my 850csi. I cut the Cats open at the weld on one end and removed/knocked out the Cat insides leaving the Cat cans empty. I then welded (stainless) Magnaflow Freeflow/Race Cats inside the empty cans, they are a snug fit. Then reweld the end back on. You would never know they'd been split open. Exhaust still looks standard. Just passed the MOT. Total cost for both Cats under £300. I'm thinking about doing the same on my M5 Elekta