It appears you can tweek the Nox.
The recent Euro6 4d regs that came in to place, September 2018, together with the WLTP fuel consumption tests in the case of the Golf R 2 litre dropped the power from 306 bhp to 296 bhp in order to get under the 2018 Euro Nox limits.
Previous to this, Europe majored on CO emmissions and the States on Nox.
There is a suggestion it was a change to the exhaust after treatment.
Last edited by Eddie Cairns; 17/09/19 07:29 AM.
