(04 Sep 2015, 6:19 pm)Dan wrote The 'K' is the mini version (ie the one which was looked at by Riverside engineering last year). The 'N' is the full-size version (ie the one which was on X66 and 8/78). Both are Euro 6, and both quite pricey. The 'K' will be a little less, given that it's a smaller bus.
Worth mentioning Volvo B8RLE 9108 or the Scania K Series Irizar , Which are both totally suited to the X84/X85
Scania K Series Irizar/E300 ( 9 Litre Engine - ZF Ecolife1 6 speed Gearbox )
Volvo B8RLE Wright/MCV ( Volvo D8K 7.7 Litre Engine - ZF Ecolife1 6 speed or Voith DIWA.6 4 Speed )
The ZF is far more suited to faster paced routes like the X84/X85 with different horsepower options in both the Volvo and the Scania .
"Performance of a Citaro but not the price tag"