2001 mustang gt 2v 4.6

  1. S

    High flow cats on a Stock 2V Mustang GT? Yay or nay?

    So my 01 Mustang GT is basically all stock, only upgrade I did was add Flowmaster 40s for that classic muscle car sound but I want it to become a bit louder without spending a ton of money, and without deleting cats completely or getting an O/R pipe because of emissions. Yes, I know I could get...