PheonixLS1

iTrader: (4)

ok, I have almost all my parts for my header install. I have pacesetter ceramic coated LT's with a 3" collector. I want to weld a 3 bolt flange to the collector and to my magnaflow cat ( also has a 3" inlet and outlet) so I can just bolt them together versus welding so if for some reason I ever have to replace my cats I can just unbolt them and bolt the new ones in. My question is what size flanges do I get?? 3"?? or does it have to be bigger than 3" so it will slide onto the collector and inlet/outlet of cat to be welded. Thanks!!