Gas question

I am not currently an owner of a SRT4, yet. I have been lookn and i cant find out what kind of gas an '03 takes. if any of you know please let me know. also would it screw up the car if i put regular in it if tht isnt wht it takes? Any advice is extremly helpful. thanx

pump 91

93 preferably..91 will give you a higher chance of knock.

Also, i was wondering if any of you know about the stage one kit. how much of a boost will that give me and also can i install it myself and also can i keep it a daily driver if i add it

(thank you for all the help)

S1 doesn't give a higher amount of boost....just different fuel/timing maps. It also eliminates the need for the secondary o2 sensor...so a cat is not needed. It is relatively easy to install and will not affect driveability what so ever.