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Your only two options are Remus or stock.
As a side note, if you were to ever move to a catless / high flow catted s-pipe, your volume increase would be one order of magnitude louder still. For some reason, stock NA headers + catless s-pipe doesn't provide nearly the volume increase of catless headers + stock s-pipe... But having both catless headers + s-pipe makes the car significantly louder. With a full catless setup, some of us that like loud exhausts can't stand any kind of race-labeled mufflers. I just ordered a set of Supersprint Powerloops to replace my Supersprint Race mufflers.
The same volume increase happens on non-M's. When I installed the SS y-pipe and race exhaust but kept the OEM headers, the end result was pretty tame. When I moved to catless headers, the volume more than doubled.
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