Do you know the flowmaster product number for the super 44 muffler because my father is a muffler installer but we cant find the muffler that will fit my nitro in any of the flowmaster product books we have. I even talked to the guy who sells us the mufflers and he said flowmaster doesnt make anything for the nitro.
I don't know the part number off hand but I can tell you that the Nitro has stock mandrel bent pipes and the super 44 just slid right on. If you have any questions, I had my work done at Carr Tech in Mission Viejo, CA. (949) 951-6143. The owner is a good guy who took really good care of me.
I think your Flowmaster rep is a little wrong. Just look at all of the people in the forums who have already installed Flowmasters. I think you are looking for a kit. As of right now, there is no kit. Simply replace your existing muffler, remove the resonator, and custom fab the rest.
I hope the information helps.