I'm new here so forgive me if I'm asking a question that's already been answered. I just bought a 2011 about a month ago and just found out it needs the converters replaced, which the warranty doesn't cover, however, I have a set of flowmaster converters that I bought for my previous truck and never used because I was told they would not pass emissions or supply the back pressure that the truck needs. I would like some input or advice from anyone with aftermarket cats that has to go through emissions testing on whether this is true or not. Thanks