Installing a High Flow Cat

[Jordan94]

At Canadian Tire they have a Magnaflow high flow cat I"m interested in but if you look just after the y pipe its got a flange and its oval not circular, anyone here install a high flow that can tell me how to turn it from oval to circular so I can install mine thanks

[Wicked_Sludge]

it'll have to be welded.

high flow cats are a waste of money...the stock cats are already "high flow" and are of the same design as aftermarket units.