Try lowering it as well, that always helps out. I'm not sure if there are any quality coilovers for the Altima but it's worth looking into. Also, I'd look into light-weight wheels to reduce rotational mass/unsprung weight.
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~Craig
1992 Nissan 240sx (32+mpg)
1982 AMC Jeep Wagoneer (19 mpg highway)
1964 Pontiac Catalina 455 (0 mpg, doesn't move)
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