I used band clamps on mine and they've been on there,leak-free, for over 4 years!
and go as high as you can, you'll appreciate the extra room for working under there!
I wish I had a sawzall when I put mine in, I only had hand tools then, and had to cut the stock pipes with a flimsy hack saw!!

Good luck!
------------------
Joe!
1988 GT, 167,000 miles!!! 13.58@105mph Check out my listing!
Click here! Or my website:
www.joe4speed.com
99 Ninja ZX-6R:10.32@135mph!
1993 Olds Eighty Eight LSS 16.40@88.8mph