I just had 2 Magnaflow Universal high flow cats to go with my flowmaster mufflers with no y pipe, the part number for the cats is 94000, put on a few weeks ago and check engine light has come on 3 times since then. i took it to dodge and they said it came up code "430 Converter Effinecy" and that its gonna be a minumum off 90 bucks for the diagnostics guys to mess with it, and that it might void the warranty. and they said to contact the place that i got it installed, which unfortunately was a small mom and pop shop that has since gone out of business. i called magnaflow and they were no help. should i let the stealership mess with it? they said since that code is on my truck is not going to run at peak performance untill i get it fixed? i would appreciate any experience and expertise on the subject.