I need to make my suspension firmer. I purchased new springs and struts and it still feels like its sagging when I accelerate. Any ideas on how to do that?

http://www.amzperformance.com/z32/?page=shop/flypage&product_id=238&category_id=360440ec44fa47d797f5ade663d4106c&;
don't ask me why it's so freaking expensive, it's gotta be a typo... even just the subframe spacers help quite a bit

to get rid of the squat when you are accelerating, buy these

http://splparts.com/Parts/NissanShared/suspension/SPLSubframeSpacers.jpg
they are subframe spacers and are found at www.splparts.com (http://www.splparts.com), the good thing about these is there are 8 of them, which means they are put below and above the subframe, unlike the greg dupree ones which just go below the subframe. also, the top ones have slits in them so you don't have to fully drop the subframe.

Does anyone know where I can get suspension kits for the Z31?