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Thread: Free flow exhaust size for R18A motor

  1. #1

    Free flow exhaust size for R18A motor

    Hi guys, what's a good size to go for when installing a free flow decat exhaust on the R18A motor on a 2008 1.8i-vtec vxi 5 door?

  2. #2
    Can't tell you for sure, but can tell you that on the hatch you WILL have drone issues at about 1500rpm, 2500-2700rpm, and a little at 4000rpm. The sedan you're lucky because you can slip in an extra box at the back that helps a lot with that.

    That little cat in the front is a very key part to that car's exhaust system.

    Speak to Abel at Viper Kemtpon Park. He did mine. (remember you'll probably need to run a piggyback system now as well to stop the motor from running too lean)

  3. #3
    Quote Originally Posted by frmtn View Post
    Can't tell you for sure, but can tell you that on the hatch you WILL have drone issues at about 1500rpm, 2500-2700rpm, and a little at 4000rpm. The sedan you're lucky because you can slip in an extra box at the back that helps a lot with that.

    That little cat in the front is a very key part to that car's exhaust system.

    Speak to Abel at Viper Kemtpon Park. He did mine. (remember you'll probably need to run a piggyback system now as well to stop the motor from running too lean)
    Kind Thanks but im based in cape town lol, but I have spoken to a guy at powerflow and he reccommends a 50mm system if you not going to be making more than 107kw.

    if you make more than 107kw then 57mm is the way to go.

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