Cadillac Escalade, EXT and ESV Forum - 1999 - 2006 Discussion, Exhaust pipe advice in Cadillac Escalade Forums; Hi, guys!
Just bought gibson 69602 dual sport exhaust, but the issue is that the stock headpipe is 2.5' in ...
I would recheck with Gibson to make sure you were sent the right parts but it wouldn't be hard for an exhaust shop to weld on a 2 1/2 to 2 3/4 adapter. They look like a small funnel. I had 3 1/2 down to 3" done from my header collector to the exhaust pipes done on my 67 Camaro.
I have never heard or installed a corsa system before so I can't honestly say if one is better then the other. I went with the Gibson because their system was quite a bit less expensive. I will say I am very pleased with the exhaust note but does have a little resonance in the interior but nothing like a hard core system like Flowmaster.