Jack rod

Ok so I have had my impreza hatch for a week now and the modding has began:-), I went to my local tuning guy last night and looked into exhaust possibilities, I am currently running a front cat then 2.5 diameter straight through to a prodrive back box. The sound is lovely but a little quiet for my liking.

So we have temporarily removed the back box and chucked together a cowboy style tail pipe to gauge the noise for a few days before making a decision. My question to you experienced owners is this. I have two options salvage my back box use the prodrive tips and bend work then use minimal extra material to make a y piece. Or sell the back box and start fresh with new tips and all new material. How much do you guys think the prodrive back box would fetch as I think this may help me make a decision.