Quality looked good on mine as well. The guys at Import Performance Specialist who installed the HFC commented on how well they grinded the inside of the pipes. I drive a lot and have already put 750 miles on these HFC in two weeks. No CEL and no leaks!
On a side note I got the new NT05 Tires mounted right after the HFC. These tires grip like no other. Makes for some really fun driving. At high speeds and cornering the NT05’s really shine. I thought the Bridgestone Potenza were a bit twitchy at high speeds not very confidence inspiring.