Join the community and post your question. Use our Ask-A-Tech for free now! ASE experts standing by.

Forum > Failed Smog Test > Question

Aftermarket Down Pipe Modified Failed Smog Test

I have a 2003 Ford F250 6.0L diesel, with a Banks 3 1/2" downpipe, from the turbo. I was informed by the smog technician that it is considered modified. He failed me. Since this is only modification and has no effect on emissions, is this true? Thank you.
Answer:

Does the down pipe have an EO (executive order) number? Is it legal for use in California? If not, then yes, the smog technician is correct... the system is considered "modified" and will cause a smog check failure. If the downpipe is California ARB (CARB) certified it should have an EO number. The number is most often printed/etched on the unit. If it is not, it will be printed on documentation pertaining to the unit. If you can prove this particular down pipe is California legal it should not cause your truck to fail the smog test. posted by SmogTips Support

Related Exhaust Headers questions and answers you might find useful:

1984 Chevy Blazer 4x4 Failed Smog Due to EVAP by kim

2003 Mercury Marauder with Heavily Modified Engine by Brad

Supercharging a 2006 Hyundai Tiburon SE 2.7L v6 by Anthony

Can I switch my Oldsmobile Cruiser to a dual exhaust system? by fred

1979 Jeep CJ-7 with engine swap. Need smog check. by Mel

View SmogTips.com in: Desktop / Mobile