Much of the concern is that oem shocks don't have adequate valving/damping capabilities necessary to properly control the increased stiffness that sport lowering springs impose . Although, initially, they may work reasonably well (usually on newer low mileage vehicles), over time they will overburden the oem shocks and cause them to wear out much faster. This is especially true when installed on older vehicles - which most 986 boxster now are . Do some research online and you'll discover numerous tech articles advocating the full M030 system versus just lowering springs .
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