hi,
i'm a new owner of a 1985 300D

i've read through some of the links here on the trap oxidizer and oxidation catalyst.
Trap Oxidizer, LINKS thread

i imagine in 2015 it's still true that they can cause damage to the turbo.
do they actually create more emissions in exchange for a cleaner looking emissions?

and my main Q is, is there any emissions filter that can be put later in the exhaust that will actually clean emissions a bit?

thanks,