Detoxx

Yes, the ecu tune will ensure all the flags are set and allow you to pass CA smog if what comes out of your tailpipe is clean.

Jay777

I don't think a CYA statement like "OFF ROAD" takes the vendor off the hook (see below). While a DIY hack is not likely to get EPA's attention, they definitely do go after (and fine) commercial entities, especially those importing non-compliant vehicles or modifying emissions systems as a business.

Tlaloc75

Churchill

If this was true, how are companies like Fabspeed still in business? Selling non-emissions compliant parts (cat bypass pipes, etc) is a significant industry in the US across all car marques. Can you point to a single company that's been popped by the EPA?

Jay777

Not sure how EPA views the bypass guys.

Keep in mind, where emissions aren't required, or where cars are exempt due to age or not being registered, bypasses are perfectly ok (or at least go unnoticed). That, combined with disclaimers like the one below are how these companies can stay in business:

"Fabspeed Motorsport designs performance products for street applications which are entirely street legal and emissions-compliant, as well as race applications with are recommended for off-road track use only. While most Fabspeed products will pass emissions and are entirely road-legal in all 50 states, certain sportcats and catbypass pipes may not be approved in your particular region or state. Please check your local laws pertaining to emissions and catalytic converters". (emphasis added).

Lots of examples here: EPA Case Resolution

The good news is that they *seem* to only go after companies, not one-off DIY violations

sacman

Could you share you experience with ECUdoctors? Living in California, just for bypassing the SAI, Readiness Flags and O2 are worth the asking price as I'm dreading going through every 2 years.

QN

Lorenfb

Find a good Porsche repair shop. Getting a 993 to set the OBDII monitors is not that difficult once the engine is running properly!
Some can set the monitors in a hours time. Buy and install this, it'll solve one of your needs; https://rennlist.com/articles/porsch...rican-drivers/

rpaitich

I just got my '96 993 back from the shop to have the SAI ports cleared. It was tough, as it was the first time in 80K miles. What's a good fuel additive to prevent or minimize the build-up of junk in the ports? My shop recommended Redline SI-1, twice a year, and only 90 octane. Please tell me if any of you have been able to delay the next CK light and the dreaded P0410 code.

Ron
Northern Calif

Churchill

I don't think your shop knows what it's talking about. Octane rating in modern fuels does not affect carbon buildup. Fuel system cleaners can help with carbon buildup on valves and combustion chambers, but they don't clean out SAI ports. The reason those get clogged is because your engine is burning oil. Only solution to that extremely common problem in 993's is new valve guides.

993_540

Preventive Maintenance is not to overfill your oil, keep it below half-way on the dipstick. When my shop changes the oil (RMG in Palo Alto), they give the last quart to me to add as needed, rather than fill to top of dipstick.

dave
95 C2
03 540i6
84 380SL