Quote:
Originally Posted by bawareca
CAT will help with CO only. DPF is what takes care of the soot and SCR is what takes care of the NO and the smell. My X5 with ~400hp/550tq will make a slight haze under hard acceleration, nothing like a rolling coal. After a few days of very hard driving the hatch and the rear bumper will have a slight tint from the soot.
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I'll mention.....
There is some benefit of keeping the DOC. The Diesel Oxidation Catalyst (DOC) not only reduces Carbon Monoxide (CO), but also unburned hydrocarbons and organic soot. So without it is much like running a car hatless and will result in more diesel stink. Its the unburned HC that makes diesel stink.
There are downpipes that remove the DPF but include a DOC to reduce the stink.
North American 335d Post DPF Removal Exhaust Ideas - Page 9