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The hump can be an issue, depending on where it comes from, who's doing the welding and how they go about it. The problem I saw was the PO slapped one in my Duster before I bought it and basically botched the whole job. He used some really thin, crappy repo piece and located it incorrectly so that you could not remove the shifter. It only takes a fraction of an inch out of place to make it impossible to remove the shifter, if you ever need to for any reason.
So I basically just tore it out and fabricated my own from scratch with sheetmetal stock.