Cam it or Spray it?
A: Downshift and be gone
B: Tell him to hold on while you get your bottle set up, then be gone.

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And if it's not enough, you still can do nitrous later
.Edit: And of course with nitrous, there will always be some dumbass to say that you're "cheating"
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If you were in NC, I'd tell you to go to http://www.tick-performance.com , I couldn't be happier with their work.
If you can afford a professional install, that is definitely the way to go IMO.
It's a bit of a tough call. My buddy installed my cam, he knows a lot about engines and is about to start a job at Ford.....lol....of all places, he drives a 02 Lighting too, but that's besides the point. While the principles of all engines are the same, each one has it's quirks. I printed out the cam swap article from www.ls1howto.com and gave it to my buddy to read before he did the swap. It took him 12 hours from start to finish. Had I not been so damn cheap and would have bought a better valve spring tool, it would have gone quite a bit faster.
Anyhow....if you do let your buddy help you with the cam install, read that article first so you learn all the little tips and tricks. Also, get a valve spring tool...the Crane/vinci tool is very slick and lets you do two at a time, it costs around 100 bucks though. The "tim" or "larry" tool does one spring at a time and they cost around 40 bucks.
Either way, you are going to have to take the car to someone to have it tuned. Considering you're going with a fairly big cam....the MS3, I wouldn't be too happy if I would have to drive that car for any period of time on a stock tune, especially in an automatic car. Sometimes trying to save money leads you to spend more money....if you know what I mean....and it sure costs a lot in nerves too! I know I was nervous as hell when we first started the car up and I heard all those new noises!
I almost think it's a better idea to take the big headache and fear factor out of the equation and let a reputable shop like Speed Inc. do it. That way you know it's done right, and you don't have to nurse the poor thing god knows how many miles on a stock tune with a big cam.
And as far as your initial question goes....cam...all the way. Nitrous bottles tend to be empty/not ready when you need it, the cam always is. And the looks you get when you pull up to a red light or cruise through a parking lot is sooooooooooooooo worth it! I could listen to my car ideling in the garage for days!

Manny

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I'll let you know when I blow my **** up.