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high flow cat

  1. Performance Modifications
    Hello, This is my first post on the forum and I just want to thank everyone for how helpful this community is I've learned a lot. My main question is based around my 2015 Dodge Challenger 392 that has a Procharger Supercharger already installed onto it. I am looking to install Kooks long tube...
  2. Dodge Challenger R/T Specific
    Has anyone found a way to run high flow cats with the XR-1 long tubes? I am running these with the ATAK catback and love it most of the time. But I noticed I have lost 6 mpg with the catless mids. I don't mind cause you don't get power with out using more go-go juice. But running at 2000 rpms at...