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Originally Posted by SkauneJohan
The thing with old NA diesels is simplicity, longevity, durability and sometimes pretty good fuel consumption
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That's why some of them still held some popularity among customers with a more traditional profile until Euro-4 pulled the plug on the Peugeot DW8 and Euro-5 led to the demise of road-going versions of the Volkswagen 2.0 SDI.
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only injection pump modification is known to yield up to Around 50hp/liter and this is on peugeot, citroen, VAG 1.6(75-80hp) and 1.9 (85-95hp) stock they had 1.6 (54hp) and 1.9 (75hp) but it is costly 
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While reaching some gasser-like specific power could appeal to a broader public as it did with the increased presence of turbochargers and common-rail injection, I wouldn't hold my breath for a high-cost tuning in a non-turbo Diesel to get so much attention from folks who would never even lurked about owning a Diesel-powered vehicle before.