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The cams will still give you a gain even without the header and still pass a sniffer as long as everything else is working properly. You could also try porting the exhaust manifold although cast iron is tough stuff. Can you have a cat back exhaust at least in CA? Also do they look behind the carpet in the trunk? If not then a piggyback and some tuning could help you too and you could even try running some performance cams like the 763 grind with larger injectors. They wouldn't be able to tell if you over clock the ECU to raise your red line either. You won't be able to hit the numbers you could with a header but you will be able to make some gains. I think Pressure2 posted a dyno a few months ago showing some decent gains with just the 294 cams. 30rwhp more at red line and a nice increase at peak. I don't believe the car had a header on it but I could be wrong.
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