Speaking of the cel being on.... Why does it come on? Is it because there are no catalytic converters? Because is has moved down the exhaust stream and the temps are out of its range now? I want to upgrade my exhaust but I don't want cel hassles. As far as the header bolts go... I remember I lost a few bolts within a few hundred miles of doing headers when I had a mustang, it made me a believer in locking header bolts.