^Streetport, 3" downpipe with 3" exhaust a cat converter and a GReddy or Apex'i barrel should treat u nicely!
The cat helps keep some of the noise dwon and i've found that apex'i and greddy barrels in general aren't very noisy, very streetable.
HKS, Mozart and RSR on the other hand are noisy as ass imo

i have a mozart on mine now, and between that and the walbro i have no need for a radio at all
From what u explained to me is the intention, i'd say:
-Series 5 (TurboII) w/ gearbox
-Streetport and rebuild with either original steel apex seals or aftermarket 3mm's
-Walbro 255lph pump, braided lines, regulator, and if u can source them some FD injectors
-Upgraded ignition will be necessary or atleast advisable
-I'd convert the TMIC to V-mount, saves on piping and distance as well as keeps the radiator unblocked, keepeing engine temps fairly cool, a must with rotaries.
-An act six puck clutch disc and pp whould hold nicely and very streetable
-Upgrade ur rad as well, a fluidyne or custom made 4 core is more than sufficient for a mildly modded motor
-Profec boost controller
-Some sort of fuel tuning would be needed, atleats to get the motor running teh way it should when rebuilt...an SAFCII works fine for mild mods i've found...and isnt as costly as say an emanage
^^Or you could contact rivaracing on the forums, he does reflashes on series 4/5 ecus, cheaper if u give him your stock ecu and he gives u a reflashed unit, i'm sure u could also have him reflash the ecu to suit ur mods etc...cheaper and less hassle than going piggyback or standalone for a street project imo..
I'm sure i forgot a couple things, but thats the general direction
i would haev taken with this, feel free to elaborate/correct/tax the ideas as you guys see fit.
As with all mih posts, i stand to be corrected, so feel free if i need to be
