Nightrider FL-XiED Fuel Enrichment for Harley EFI Plug - n - Play DK-FLXiED-10-NR The Plug-n-Play FL-XiED-10 richens the Air Fuel Ratio from14.6:1 to 14.0:1 in closed loop mode. Immediate Benefits: Lower Engine Temperature - Lower Exhaust Temperature - Improved Throttle Response - Reduced Surging - Reduced Pinging Recommended for: Stock Configuration - High flow air cleaner - High flow exhaust - "Stage 1" (both high flow exhaust & air cleaner) The FL-XiED-10's are a cost effective alternative to an aftermarket tuner & dyno runs. FL-XiED-10's will cool your bike down and make it run better.