I was more worried about messing up the suspension geometry. It seems like 4" is over a half inch lower than I have seen anyone running or suggesting.Anything under 4 inches puts you at a challenge with speed bumps: Speed bump - Wikipedia, the free encyclopedia
You can go lower if you change the uprights - you can get them with relocated hubs from Eliseparts which give a 16mm drop in height with no change to wishbone angle:
Elise Parts - Steering & Suspension - Suspension - GT Hub Upright S2 (Front Pair)
Elise Parts - Steering & Suspension - Suspension - GT Hub Upright S2 ( Rear Pair )
Great reads, Thanks.More than you ever wanted to know about this subject:
http://www.lotustalk.com/forums/f163/alignment-etc-233817/
And also:
http://www.lotustalk.com/forums/f91/lowering-track-pack-ride-height-even-further-58272/
Without the drop uprights you don't have a lot of room to go lower than stock.