Need some help on suspension modifications please.

[The Radium King]

stiffer front sway bar. will reduce body roll and improve turn-in. will not detract from ride quality. m030 (there used to be a great chart that showed the relative thicknesses of the various bars) is good option that doesn't require special drop links. or a 996 gt3 front sway bar - will require aftermarket drop links, but is adjustable. don't use H&R - too stiff, too heavy.

don't mess with the rear (yet); the boxster tends to get tail happy quick when you start messing with it.

also look at alignment - as much front camber as possible, keep rear about half degree less. the amount of adjustability (or lack thereof) will ensure that you won't get so much camber that your car gets darty or your tires start wearing funny.

i think when you say 'stabilisers' you mean strut braces which are different - they are there to keep the top of your struts from pulling apart under hard cornering - don't think you are there yet.

[tommy986]

This page has chart for early cars through 2002.

CB-Racing, 986 Suspension Info

Using this info, on my 2000s, i went with the m030 S front bar and the m030 non-S rear, (since it was stiffer than m030S bar)

After that I installed ROW m030 springs and shorter sport shocks to lower the car a little.

Felt just right for track days and still street-able.