exhuast suggestion

[rs4pro3]

ok I'm trying to figure out how to do the exhuast for my m30 engine swap.
Today I picked up a free set of dual E28 535i down pipes, and and was planning on mating whatever I do to the 325i muffler.
Now for the center I was thinking of maybe a high flow cat, or 2 small resonators.
I don't want a loud Exhuast, my 318i was like that and I got tired of it. I love the stock sound fo the 325i exhuast so I want to try to stay around that same noise level maybe a tad louder.
Any Suggestions?
I'm trying to go as cheap as possible with minimal custom work involved.

[Digitalwave]

If you want it to be quiet and like the sound of stock, why not just leave it stock? Exhausts really don't net us any power, I would imagine its not much different with M30s.

[rs4pro3]

I don't have a stock m30 cat just the downpipes, so I might as well buy something aftermarket to take up the 2-3 foot gap between the down pipes and the muffler flange.