Quote Originally Posted by LPS74 View Post
New to me b7 s4 cab. Looking to gut the pre cats. Is there a gasket between the exhaust mani and the DP?
No, there is no gasket where the exhaust manifold meets the downpipes. When you get to that point of the reinstall it is imperative that you take the time to verify the surfaces are together flush and evenly bolted together. Otherwise you'll end up with an exhaust leak and have to go back for adjustments.
Only other thing is be careful with your sensors, as uless you take them completely out, they will not freely spin which stresses the shielding of wires.