I have the exact same setup
y-pipe from cats to a straight pipe to the back where it meets the single inlet of the magnaflow muffler.
The muffler is the chrome, stainless DTM tipped one.
i think it sounds much better without resonators on there. With resonators the sound goes away above 2500rpm, and then the car is quiet (which some people like i guess....but not me =)
i also felt more of a boost in performance without the resonators on.
my next step is to replace my cat with a single cat because i can't afford the bmw oem one =/
but as for the exhaust, i love it, but i might change it because it doesn't suit what i'm doing with my car. It sounds like a race-car, but i think i want to switch to something softer.
but i do have to say i am happy with the results
also this was on a 325i
'94 Supercharged E36 325is (150,000 original km's)
-Vortech V9 G-Trim @ ~10psi w/ BOV
-255LPH Walbro fuel pump
-TEIN SS Coilovers w/ Pillowball mounts
-Keskin KT1 17x8.5 & 17x10
-Remus full catback
-Authentic Rieger Infinity I body kit
-SMT6 EMS (Untuned)