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  1. Bolt-Ons and All-Motor
    I'm looking to buy the Unorthodox racing pulleys but I just want to hear some reviews about them, do you need to retune after installation? Anything will help thank you!
  2. Exhausts and Downpipes
    This thread is dedicated to Invidia 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. Q300 Exhaust: Specs: Large...
  3. ECU Tuning
    The below was taken from the Hondata forums. "Reflash with CAI It is my understanding the stock 2012 Si is very adaptive, meaning it easily rejects bolt-on mods and continually makes corrections returning any benefit one might get from a properly designed Air Intake back to stock...
  4. Si Only
    With my older Civic, i found Spoon Sports and T1R to be my top favorites for performance. I used some Injen parts in the past, but i ended up selling them within weeks of buying it. What are your favorite aftermarket performance brands?