yeah like nightcrawler said! i think i was quoted just under 2k somewhere for exhaust, it included a cat, resonator and a muffler! but it was gonna be abit loud, i think the last r33 they tested was like 96-97 db with the same exhaust! i wanted it quiet so i shopped around and pick up a jazma 3" cat back for cheap as chips! got a 3" xforce front/dump real cheap as well! i then picked up a 3" high flow cat from an r34 for like 50 bucks! but i ended up decating my own cat but all up i spent around $500 on my exhaust system! just shop around if you don't wanna pay that sort of price
as for the fmic! i have never run into one which just fits directly without any modifications! i always ended up bending pipes and adding some on