Looks are as far as it will go. Ark has had problems with cracking welds, having to replace the mufflers, having to replace the resonators... The only thing that hasn't had a "recall" is the tip, i think. QC?
I've yet to see any other cat-back manufacturer that had to do that for its 3 customers cause of stuff breaking.
You can wait for SCI's
http://sportcompactindustries.com exhaust when they come out, or F2's
http://f2cars.com. Mazdaspeed is based on Magnaflow, so it will start droning eventually (having owned several, and having friends that do).