I bought cheap B&G lowering springs on eBay a few years back with new sachs struts/bumpstops and Kmac adjustable top hats. My take- struts and cheap lowering springs are absouletly perfect. I would not spend the extra money on H&R as i dont think its neccesary. Car drives absolutely perfect, like OEM. Regarding Kmac top hats- overpriced, garbage, junk parts that i will never buy again. Just poor fit, finish and quality. Replace with OEM bearing, top hat, etc. For rear, simply coding of the air bags to lower. This will depend if you have air suspension on rear axle obviouslly.