Since your impulse was new, air systems have become lighter, more easily serviceable, and (debatably) more consistent. They've also all become screw in - no more rail mount tanks. Almost any new system you pick up will do you well. Most people tend to favor Ninja or Crossfire tanks, but there are many quality offerings out there.
Any standard output tank should work on your impulse, provided it's the model with the vertical max-flo reg (or some kind of reg!), and not the one with the gas through grip. This same type tank would work just fine on an Axe.
My oldschool PBN Feedback +48 Positive/ZERO negative : before the days of this "fancy" feedback system.
"When people get a little too chummy with me
I like to call them by the wrong name
to let them know I donít really care about them."