2003 Buick Regal LS

[Eric H]

Aftermarket Magnaflo converters are available for your car from O'reilly Auto Parts for either $219 or $312, they are relatively easy to install since they bolt on at both ends.

http://www.oreillyauto.com/site/c/se...gal&vi=1410376

You should also replace the O2 sensors, or at the very minimum replace the upstream one.

You'll also need a can of PB Blaster to keep the bolts from seizing up.

[Captainclock]

Originally Posted by Eric H

Aftermarket Magnaflo converters are available for your car from O'reilly Auto Parts for either $219 or $312, they are relatively easy to install since they bolt on at both ends.

http://www.oreillyauto.com/site/c/se...gal&vi=1410376

You should also replace the O2 sensors, or at the very minimum replace the upstream one.

You'll also need a can of PB Blaster to keep the bolts from seizing up.

My dad and I would do our own work but neither me or my dad have ever replaced a catalytic converter before...