I've cut my springs and I'm happy with the results.
Did it gain aero and fe? I don't know. If so, it's very small.
Did it ruin the ride? No. It's definitely is harsher on big bumps- after all I took away about 40% of the compression travel. It gained a lot of stability in cornering.
For a while I ran a bigger sway bar in front too. I switched back to stock because with the lowered height the stability was so improved, that the bigger bar wasn't really helping- all it did was add a little unnecessary harshness.
On the back the springs aren't long enough to stay preloaded when the car is jacked up off the ground. So I suppose it's possible for the spring to unseat if I ever get the car airborne. I don't even know how many years ago I cut those springs, but it hasn't been an issue.
I did re-shape the last coil after cutting so it would sit nice and square in the seat. I used as little heat as I could while squishing it in a vise. No problems.
I cut 1 3/4 coils off the front and 1 coil off the back with a chop saw.
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