Basically, it is illegal in CA to change cats period unless they are damaged or not functioning properly. In my experience they don't look under the car when you do a smog check. There are CARB numbers on the cats themeselves on my BBK short H-pipe on my '00 (for longtubes), but getting CARB approval takes time and money, so I doubt if the whole H-pipe itself is legal, which is probably the case for most of the ones out there for new cars. You may want to check Bassani as I believe that is what comes stock on Cobra R's and therefore must be legal for use in CA. 
		
	
		
		
		
		
		
		
			
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				Strike down the unroadworthy! 
2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more 
'94 Rio Red Cobra: All the bolt-ons, 3.73s
			 
		
		
		
		
		
		
	
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