Originally Posted by Born To Lose
what if my muffler shop skipped the flange that connects to the b-pipe? Instead, he just welded the cat to the flange of the exhaust pipe. Would this pose a significant disruption in flow characteristics?
Nope... the only problem that it will cause is if you have to take of a single section of the exhaust.... With the way the cat is welded on, you'd have to take a lot more off before work could be done.