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Headers and exhaust aren't going to add 50 hp unless the engine is some totally modified hot rod cranking out 350+ on its own. On a stock early 928 its going to be MAYBE 20 hp.
The big club of the Calif smog law, maybe the federal part, is the non tamper clause. That usually means alter nothing between the air meter and the cats, but before the air meter and after the cats its a free for all. In theory you could put in a boost system, leave it in, and bypass everything back to stock for the smog check.
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