I've pretty much given up hopes of getting any extra useful HP out of my 3.0si. I just put in an AFE intake. It sounds a bit better. A new exhaust system is next. That should make it sound a lot better but not faster. If I still want faster in a few years, I'm thinking of picking up a used M3. But after getting my Z back on the road this spring, I can honestly say I love driving around in my little roadster.
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