I have a set of 09 headpipes and want to cap the o2 sensors then use a VH fuelpack..I am running SE fatshotz for mufflers and wondering if it would work and if anyone has tried this or will i need a racetuner to eliminate the use of the o2 sensors ...want to get rid of the cat but keep stock pipes just in case.

I dont know about the VH fuelpack, but I have a Doebeck TFI on mine with 2009 headpipes, O2 sensors plugged off. This is on a 2010 Ultra.

Do you have the 08-09 version tfi because of the catless pipes or are you using the 10-11 version?

I'm running the Vance and Hines Fuelpak with my 02 sensors unplugged, with cat removed on my 2010 103 limited. No error codes, 40mpg, idles better, runs and sounds strong, no pinging or other engine noises, plugs are nice and tan, not all white and hot looking like before.