Get NOS, then re-tune=)...Check craigslist, Nitrous systems go for low prices all day. I love Nitrous in moderation, I mean how else can you gain 100hp with less then $500....Hell 100hp for $1000 is still a bad-a** deal. Some people look down on Nitrous as the poor man's racing solution, but I don't give a sh**, they aren't the ones getting their head slammed back into the seat with a big smile for a few bills. I'll probably run moderate Nitrous on everything I have from now on.
And like Deer said, run some damn band clamps! You can get it on there and enjoy, and if you end up noticing an exhaust leak, then just take it in and have that joint welded