I have a tailpipe that I need to cut to get out of the car. It's stainless, 3" diameter. I'm putting a rorty exhaust on my Mazdaspeed3. I have a sawz-all, an air die grinder and an angle grinder. Which is the best tool to use (cutoff wheel in the grinders). Or should I buy an exhaust cutoff tool? I assume that a hacksaw will take forever. Eric