lowering w/ 18s

hey guys, really appreciat the help, a couple more question.s

94 integra sittin on 18X7.5s with 215/35 18 tires. Im thinking of lowering my car and was wondering how much you think i can without the tires rubbing on anything? My friends says i cant do it too much cause my rims are already oversized. if any of you with 18s could tell your story of lowering your 19+ integra would be helpfull.

also someone told me about air shockes, you can change the height before you like go over a big bumb with our getting out of your car. there different from airbags and made just for chaging height slowly.

if anyone knows about the height limits or the air shocks plz help out, thanks

you could get air sturts which give more lift then an air cylinder, or you can juice the bitch