I was wondering if there is anything different on the '04 GT exhaust system from the 99-03 years. Mine kinda cracks at a low rev...sounds almost like it has Magnaflows on it. Different factory mufflers? Something with the stock H or converters?
Yup something is different The 04 midpipe is different. Still has 4 cats but the O2 sensor location has changed and supposedly the amount/type of catalyst is different.