Golf R32 Merge Collector?

[CSR]

Hi,

So i've bought a set of HJS cats from the U.S. and have been speaking to the guy there (never told me his name but he's a really good bloke and into his tuning). The "How to and Why" section of his website ( How to replace Catalytic Converter? For BMW, Porsche, Mercedes, Ferrari, Maserati, Lamborghini, Bentley, Range Rover, Ford, GM, Chrysler, Honda, Acura, Nissan, Infiniti, Toyota, Lexus, How to install a Catalytic Converter? ) shows his own '98 M3 having the cats replaced. Near the end, there is a small plug regarding merge collectors being installed (I think between headers and cats).

This might be a REALLY stupid question as I'm not an expert by any means about anything car related, but going out on a limb here, would there be any benefit of merge collectors:
A) For ANY car?
B) for a MKV R32 ?

Reason for my curiosity is that I had e-mailed this guy asking about headers and he said he doesn't have them but would recommend me doing this mod instead (not that he sells the merge collectors so no vested interest for him). I did a bit of googling and could not find ANYTHING with "Merge collectors" and R32 together. Basically seems like it joins two pipes into one and then goes back out into two pipes, so not sure what the purpose of it would be either???

Anyone have an idea to comment?

[Guy_H]

We call it an "X" Pipe & have used it in several V8 Applications. If you do your homework on the VR6 and the way the flow is out of the headers, I dont think you will see much gain having that further down. Generally its used to bridge a split system, the VW one already goes back together.

[Guy_H]

more info in this link:

APR - High Performance Development for Audi, VW and Porsche Vehicles.