I bought a 2011 subaru wrx about two years ago. My first mod was a factory SPT short throw shifter with bushings installed during my first oil change. Later on, I have bought a kartboy short shifter with bushings and had it installed with the SPT short throw shifter already installed in it. My question is, is it alright to leave it like that? or should I replace back the SPT short throw shifter with the stock version and keep the kartboy short shfiter?