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ca smog

  1. NG900 & OG9-3 Workshop
    Failed CA smog three weeks ago. Ordered a new flex pipe (mine had a hole in it and was loud). Installed it, retested this morning, NOX is now 100 to 200 PPM higher than it was at both levels. Everything else is very low. Any ideas? I used a bottle of fuel system cleaner in the tank before the...