I have trying find out what SLS stands for as it is mentioned in some of the maps, for example:
Triumph twin aftermarket exhaust
Airbox removal, K&N filters
British Customs (BC) mufflers
No OČ sensors, no SAI, no SLS
(Map duplex of 20188Map2009AIRBOXBONNY, mechanical odometer, first issued by BC)
Basemap is 20498 Arrow 2-2.