I installed MM LCAs, FRRP UCAs and removed the quad shocks (they were in bad shape) and no problems to note. It becomes a personal preference. Here's my advice to those who have the same question/concern: If you install LCAs test drive the car with and without the quads and do some burnouts, simulate a 1/4 mile run, or whatever floats your boat and see how she feels then decide whether or not to remove them. This way you can eliminate personal opinions with true data. In the performance world this is how performance parts are measured - with and without, before and after - to measure differences. Oh by the way, after performing such test, you should, just as is done by the performance world professionals, post the results for all to see. Just One Man's Opinion keeping it real.
Peace