Lmao, no **** you're gonna blow your stock shocks with cut springs.
If you're gonna buy some Koni Yellows, the only coilover sleeves i'd recommend pairing them is ground controls. This set up will run you close to 950+. Bought mines brand new for 960 almost a year ago.
If you are on a budget, just get some FF type 1's and you'll be more than happy.