I've been running a Mazdaspeed setup for a few months now...
Mazdaspeed 4-1 exhaust manifold (type-1) w/ heatshield
Mazdaspeed sports sound muffler (type-1)
The size is not too much bigger from STD
Also put in a magnaflow bolt on high flow cat with it. The mid pipe is a custom job (2 inch, no resonator).
whole system is 50mm/2inch all the way from headers to muffler, with a 70mm/2.75inch exit.
these were the first gen of parts avail for na6ce by mazdaspeed, and by design they are all black. The exhaust itself is made by Yumex (which make the std oem muffler on na6) so I expected it to be a very mild upgrade.
Performance is good, and the sound is very close to stock except with a little more bass. Idle is silent, on cruising speeds its identical to oem but significantly louder at wot. The rasp is still there but there is more bass during decel and mid rpm accel. Low end is lacking (prob due to the 4-1 header design), mid range felt almost the same but top end 5k+ was noticeably better!
(I have since put in a drop in corn*s ecu and low & mid range is back)
The rev matching on downshifts... mmmm gotta love dat sound
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