http://www.ebay.co.uk/itm/Lambda-Spacer-Angled-o2-Sensor-Adjustable-Extender-Exhaust-Decat-M18-Lamba-60-dg-/320933184211?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item4ab91bc2d3#ht_694wt_1031

http://www.ebay.co.uk/itm/O2-Oxygen-Sensor-spacer-extender-De-cat-short-NO-eml-Engine-Light-canceller-/180910316717?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2a1f185cad#ht_2077wt_1265

Takes the end of sensor away from direct gas stream, but still allows it to sniff the gas content correctly