I don't think you do but I would be on the safe side and get it tuned. Nitrous is a problem waiting to happen, but it all depends on circumstances. You're close to Livernois Motorsports, right off Michigan Avenue. Take it there and have them tune it so you're on the safe side and they'll re-map your A/F to really improve performance. That's my honest opinion.
yes i wouldnt even think about it with out getting it tuned and do direct port not through the blower i could be totaly wrong about tuning but with the s/c on and then nitrous i would think you would need a tune!