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  1. Fullrace catless downpipe CEL help.

    Mechanical Problems & Technical Chat
    So I just got a Fullrace 3" catless downpipe installed on my 2013 civic si coupe. Now I know since its catless that it will throw a CEL and to my knowledge if you use a flashpro to disable the "P0420 catalytic efficiency error" then the CEL should go away , right? Well I did that and when I...
  2. FLASHING CEL on 4th gear after at 6k RPM?!

    Mechanical Problems & Technical Chat
    Hello guys, I'm new here. I recently purchased a 2013 fb6 sedan. I purchased at 29xxx miles and was previously on a lease. the previous owner did minor cosmetic mods, most which were replaced to stock, however the muffler sounds a lot deeper than normal sis. I'm surprised they didn't change it...
  3. Ultimate Racing Civic Si Exhaust Thread

    Exhausts and Downpipes
    Ultimate Racing Catback Exhaust - 2012 Civic Si Ultimate Racing Civic Si Exhaust Thread...
  4. Full Race Civic Si Exhaust Thread

    Exhausts and Downpipes
    This thread is dedicated to Full-Race exhaust systems for the 9th Generation Civic Si. Please keep information/questions about this particular brand of exhaust system limited to this thread to avoid confusion on the forums and to keep it neat and tidy. Specs: 3" Catback Exhaust System...
  5. help me pick an exhaust or downpipe

    Bolt-Ons and All-Motor
    im already planning for my mods to the car even before i get it. but since im probably going to be putting nitrous on it im thinking of changing the headers at the same time. is it worth that extra money to get some nice 4-2-1 headers?