Yes. It is generally not advisable to use co2 to run on any high end marker as they damage internal and cause seals and o-rings to break often. Plus you dont get the consistancy output pressure with co2 as you do with air. Pretty much most people will advise you to get air not co2. I run my impulse on air and have had zero problems touch wood.
more info on your Implulse.. You run it on CO2, with a anti-syphon tube? Do you have a Max-Flo on it? Does this help the consistency, right?
No damage you say.. I could probably buy an Impulse with a max flo, and use any propellant i bump into! Btw, what's a Low Pressure Regulator do in terms of CO2?