Just picked up a new NX kit (at a used price) and was wondering which nozzel is better to use...the Piranha or Shark?

 

It depends how much power you want out of it, and how much room you have. If you've got plenty of room and don't want more than a couple-hundred horsepower ( ! ) then either might be fine. That's based on spending 2 minutes in the NX catalog, not first-hand experience:

http://www.nitrousexpress.com/Catalo...atalog2010.pdf