Yes the hat is the problem...but the thing is you shouldn't have to modify these things to work...That is my point. People have paid good money for these brakes and the application is to fit our cars. I should of went with the baer kit...do you know the bear kit is selling for 645.00 now? that is a killer price...once I get this problem figured out these things are history. AEM is lucky they have a good wide band o2 because it's probably the last product I will buy from them, after I talked to that as*H#le on the phone. It's no wonder they sold the rights to power slot...power slot knows how to make brake.