Advice on my celica, ss11 Options

[H7OTT]

right im new to this site this is my first post so bear with me. I have owned a celica gt i think it is an ss11 cause it is very low how do i tell ? also do you think i should remove my rear spoiler will it look better? my car was imported all the mods were done when i bought it , their are some engine mods they are - hks air intake jasama downpipe and fullstainless exahust, this may sound impossible bu ive had the speedo round to 165mph i know the speedo is about 8mile an hour out the previous owner told me but that means i was doing 155mph+ could this be right as i say i dont know too much about the car would appreciate some advice.. oli