That's because the 8 and 9 are death traps in an accident. The X does much better in crash tests, especially side impact. (hence safety equipment added carrying weight) The X has a slightly nicer interior, responds better to mods, has almost everything redesigned from the ground up, AYC, bigger brakes, bigger/wider tires, etc. It's nearly the same quickness considering stock 9 vs stock X, and quicker around tracks due to more power (and better controlled power to the wheels) and better handling. But, an FQ model Evo with extra power is not worth the extra money spent. Doing a simple ECU reflash for a couple hundred dollars on a stock X can bump you up about 50whp.