nah dump valves do nothing for diesels mate,
What are the benefits of the green cotton filter Lenny, i used to put an Sti paper filter in my Subaru's and there was a definite performance improvement.
Never really considered any inductions upgrades on a diesel, I've never been one for dump valves and the like just subtle natural upgrades such as air filter and exhaust systems
Blanking the egr prevents exhaust gas Recirculation,
Preveting the induction system from being contaminated with carbon and oil becoming caked with carbon aswell,
After blanking the engine gets 100% induction from the atmosphere through the air filter,
Green Cotton Induction filters are free'er flowing capable of meeting engine demands, there also hand built resulting in no glue spreading over the filter surface
See my guides on blanking egr and filter upgrade on 1.6tdci same principals apply to your mondeo tge technical details and advantages are the same regardless of engine size,
The suppliers in my guides can supply specific parts for your engine too, so you can avail of the 10% discount too.
Egr blanking info:
Induction filter upgrade info: