[jimpern]

I have a 328 (U.S.) that may need a new catalytic converter soon.

Does anyone have personal experience with aftermarked converters like Hyper-Flow or Max-Flow?

 

[Ferrari328GT]

I got a set of direct fit Max Flows from Sports Car Converters in Laguna Hills, California, for an F355 spider. They fit and work just fine. I was a little concerned that they would change the exhaust note, but they made no difference. Their communication skills are not as good, unfortunately, so you have to keep after them to make sure they really ship them. But the price certainly was right. Good luck.