Xbox, The shifting truth

I have been debating on buying a $100 sequential shifter mod for my driving force shifter to use on FH4 for Xbox. I know other games have support for sequential shifting but Horizon 4 is all I play anymore and I’m trying to figure out if it will let me map 3rd & 4th to shift up and down. I’ve tried to find the answer for hours and every forum I see is out dated or has a different answer than the previous. So I’m asking for anyone that has tried it recently or is willing to find out to let me know if you can remap buttons for sequential shifting in FH4 on Xbox . Thank you