well i decided to lower the car a little bit...so i used the tool to lower the car like half an inch. and of course when i get to the last one...the "nut" is stuck...got the bottom one loose but the one right under the coil won't budge... so i end up bustin out the pb blaster and wd40 but its still stuck. so i'm thinking maybe the pressure from the spring is the cause...so i end up buyin some spring compressors and guess what...it still won't budge. what should i do now? and btw does hks sell the "nut" seperately. sorry if i don't know all the terms concerning the coilovers.

is the housing AND nut aluminum? i need to know

impact wrench, it's the only way to work on exhaust or suspension

i think you are confused, there isn't a way to use an impact on coilover spring perch. I've seen some get stuck so bad that off the car with an air chisel wouldn't even move it.