Hi, my name is Patty Jo and I have a 2000 Nissan front tier SE 3.3 V6. I was told a while back I need to replace the catalytic converter's because they're failing. I went to a local muffler shop yesterday and the guy told me I have four catalytic converters end it was going to cost me $3600 to replace them. :surprise: I walked away. I have a friend who son is a mechanic and he said they can replace them for $1500. Which is great, except I'm afraid he will use crappy parts. I really need advice on what to do and what to look for. Can anyone please help me? This truck is my "baby", it was a gift from my mom, and it has never given me a lick of trouble. Until now. It has over 240,000 miles on it and has always run like a champ. Thanks for any and all advice.