I have a 2007 lowrider. I replaced the pipes with v&h staggered duels with the quite baffles and have a screamin eagle stage1 air cleaner. I installed the tfi on my bike tuned it according to the instructions. I didn't put the o2 sensors in my new pipes I just plugged them. installed the by pass sensors on the o2 plugs and hid the out of site. Bike runs great, gets about 42 mpg.