Has anybody converted a dual cat car to a single cat car and made OBDII happy?

I was thinking about buying a high flow single cat setup with headers and welding in an additional O2 bung for the second O2 sensor.....

Will the OBD II computer have a fit with flow from both banks hitting the post cat sensors? I ask because the new position for the post O2's will be technically seeing double the reading it is used to....

Opinions.....comments?

 

Without a tune it will probably have a fit. Just have the after cat O2s edited out and then don't worry about it. Any particular reason you are going to a single cat design? A dual cat design will flow better.

 

Well, that's a good question. I guess I'm just tired of fighting after market exhaust design flaws. I have had multiple problems with this random tech y-pipe, one of which was my own doing...I thought one of the O2 bungs was in the wrong spot but I was wrong it was fine(install issue on my part).

But the other issues I've had with it are very real. Many are just fitment issues...however the most serious is fact that the collector flange openings are bigger than the stock gasket hole openings....that never allows the flange to clamp the metal ring of the gasket...so, the paper of the gasket is exposed and gets burned by the exhaust gases and presto....instant exhaust leak.

In many of the single cat header designs the collectors on the ends of the headers are not just a flat flange. The are the rounded doughnut type. They seem to seal much better than a flat flange and gasket. I guess what I really want is to get away from the flat flanges. Most dual cat headers don't do that.....

It will take a pro shop to do this for me, but Mac offers a set of headers with an ORY for the dual cat cars. I may can take those headers and my dual cat y-pipe and get a shop to make them work together.