Sorry nothing towards you guys running flowmaster Im just not a fan. Where I live most people who own mustangs have flowmaster.... Which sounds like sh** once the engine revs. Anyway for the loud exhaust stories one day I left high school I was beating on the jeep and all of a sudden the exhaust just fell off! The clamp broke before the cat and let me tell you the 4.0L with no exhaust is freaking loud.... I got kinda lucky though the O2 sensor held the exhaust up for a few miles to my friend's house... needless to say the sensor went a few months later