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Going from 160 to the 190 (stock) was a big improvement in the tdi.
Ceramic coatings could improve efficiency . . .
Best credit I can give to ceramic coatings is
A friend of mine had Ceramic coated piston tops (7mgte heavily modded) he was running lean (before the days of cheap wideband o2's) and he melted his cylinder head. (yes that big beefy chunk of aluminum melted holes clean through) and the pistons live on in another motor. So yes, ceramic coatings can do amazing things, if I was to build a motor they would go on everything.
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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