milzymotorsports.com has a downpipe with ahigh flow cat but only available for the 3.8, i need it for the 3.4, is that ok to use or do or is there a downpipe with a high flow cat i can get somewhere else for 3.4? im lookin to completely redo my exhaust and need help findin parts. im goin 3" pipes with a high flow cat and flowmaster super 40's delta flows, anyhelp on advise or where i can get these parts is much appreciated

 

yeah magnaflow makes the part u want. DP and highflow cat with ubend delete. should be 150$.
23433 is the part number