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Try a secondary cat delete. Top Speed offers them for $200 and should be good for 4 to 6 hp. It should still pass CA smog as it will not throw a code as long as they don't do a visual which most don't on these cars.
Other good option is a underdrive pulley. Also about $200 and is worth about 5 hp.
Anything else get real expensive relative to the results.
I used to live in Pasadena for 35 years.
Good luck.
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03 Carrera
02 Boxster S Guards Red, black interior with matching hardtop
89 Carrera 4
89 944 S2
78 911SC
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