from what my understanding is. the rs came to america without ac but with the jungle package where ac was an option. because just about everyone wanted ac in their cars, mitsubishi then put the ac back in at no extra charge. I had this argument with someone on evom. Not trying to start anything here, just maybe clearing up a misunderstood issue.
The RS did not come with speakers. I usually take mine out at the track. Hey every lb counts!
You can install a radio and speakers on the RS just like with the early STi's which came with no radios.
RS also does not come with the wing, nor a rear windshield wiper, or HIDs, 05s have an aluminum roof but the GSR suspension not the MR Bilstein suspension, RSs come with a 5spd like the GSR. RS's also only came in two colors red and white. RS's just like the 2g DSM RS's come with black door handles and black mirrors.
All 05s come with ACD