Also depends on the design of the spacers. Some spacers go in between the spring and the top plate, therefore preloading the spring and stiffening the ride. Some go in between the top plate and the strut mount, but like Jeff said, they still change suspension geometry.

88 4R, 350 V8, R150 5 speed Sold <...uot; />
97 4R, stock, daily driver
98 Sienna, kid and dog hauler, wife's ride