My 2005 RX 8 has been a great car. However, in the past 1.5 years, when I accelerate it doesn’t "jump on it’ like it used to. It will eventually get up to the speed I desire, but she has lost her quickness.
Has the fuel filter ever been replaced?
air filter, fuel filter, cat would be the three most likely causes, assuming the routine maintenance has been kept up to date.