With everyone out there doing mods to the exhaust system...
Has anyone come across a a replacement for the mid-section of out exhaust (the one with the 2nd cat).
Actually what I'm looking for is something that replaces the 2nd cat with a high flow cat, and ups the size to match my bosal exhaust.
I plan on getting a new exhaust header when someone releases them, and then I think my 2nd cat will be the next bottleneck.
I'm hoping someone makes these with 2 O2 sensors so we can relocate them. From reading posts here, the ECU sends a fault if both signals are the same, so we need a connection before and after the new cat. We need a solution before we put in the header..

 

Read the thread 'exhaust measurements' in the engine section. We are working on this very thing. I've torn my system apart to see what makes it tick and am taking measurements. The Man has an exhaust guy that will be figuring the flow characteristics of the cats based on the size of the honeycomb, ID inlet and outlet, and ID of the housings. Once he does the math we should have a pretty good idea of what the stock stuff will flow and what needs to be done to improve it.