Because of its lower pricing and longer list of available options, Honda considered the new Civic Si to be a more viable choice for performance minded young men, who were the most common buyers of RSXsBasically, the car was marketed to people who liked performance. But, for a way lesser price tag, they could get a Civic Si with around the same performance and different options, so people went for that.Then, when Acura was expanding, they deicded that the RSX wasn't a viable alternative to the Si because of the latter's price, mostly, and it was replaced with the TSX.