SSI in CA
05-06-2011, 09:20 AM
#1
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SSI in CA
I've searched the forum for answers but unable to find it. The folks in CA I have a 78 SC that needs new heat exchangers. I would like to install SSI or headers on my car. I'm located in the Midwest at the moment but anticipating of moving back to SoCAL soon. Can I pass SMOG inspections?
05-06-2011, 10:09 AM
#2
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SSIs or headers have no provision for the use of a catalytic converter so you would fail the visual but might be able to pass the tailpipe. I do know of people who have built a custom cat that fits where the muffler usually does in order to pass smog.
05-07-2011, 03:02 AM
#3
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SSI's are not legal in CA for a 78 according to the letter of the law. There are many smog check stations that won't know what the correct stock setup is for your car so there is a chance you could pass the visual inspection. I doubt the car would pass emissions without a cat though. I have seen SSI's used with a custom exhaust that utilized a very small cat on each side between the heat exchanger/header outlet and the muffler inlet. The owner claimed that it passed CA smog on his 87 Carrera. But just FYI, CA smog is a real hassle!! If you want to mod the exhaust I would suggest keeping the stock system for smog and bolt on the system you want between biannual smog checks.
05-07-2011, 11:40 AM
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Unfortunately the stocks are rusted out. That's the reason for replacement. What are the rules if I register as antique? Do you know HP gain with this setup?
05-07-2011, 01:45 PM
#6
RL Technical Advisor
"TT Oversteer" offered excellent advice; you'll not pass smog without the stock exhaust unless you live somewhere they do not test those cars. Only pre-'76 cars are exempt from smog testing and inspection. Many people here do this bi-annual swap between the stock and a SSI system to enjoy the performance gains.
You can always buy a used pair of HE's for this purpose so thats not a big deal.
SSI's and a good dual-inlet Sport muffler are worth around 20-22 BHP so its well worthwhile if you are looking for more performance (something difficult to do on these CIS cars).
