my "redneck" suggestion was just a simple way to hide any visual modifications to your car im sorry I don't live in communist California I live in pa man... my county only has a visual inspection requirement that isn't even upheld aslong as your not racetrack loud .. whereas Pittsburg has stricter laws on emissions
after reading some law I found a example that may help so don't bash ..
""Can I remove my stock exhaust manifold/catalytic converter and replace them with a header/catalytic converter combination on my RX-7?
Not legally. As mentioned above, CARB or the EPA does not allow relocation of any of the stock catalytic converters. They require that all original catalytic converters be in their original positions, and replacement of multiple catalytic converters with a single non-exempt "high flow" performance unit is not allowed.
Although using a header (or downpipe) and catalytic converter combination might pass a tailpipe test at a California tailpipe emissions test, it would NOT pass the visual inspection portion of the test. Since the engine configuration of the rotary engine in the RX-7 is rather unique, it is possible that some test station technicians may not be familiar with the this layout, and they may not even notice that a header (or downpipe) and/or replacement catalytic converter has been installed.
http://www.racingbeat.com/mazda/perf...emissions.html