No. Pull the new exhaust out and examine it. You will then be able to tell where you need to unbolt your stocker. I haven't touched my exhaust in a whole but I believe you will need a 12mm, maybe two. And since its been getting the weather for a decade your more than likely gonna want to saturate the bolts with PB Blaster or a similar spray to break rust up and break the "freeze".
After getting things loose, go ahead and start popping off the rubber hangers, soapy water will allow you to do this more easily. It also doesn't hurt to do it in the warmest of temps possible, as the rubber gets more pliable.
Any other questions, feel free to ask.
2002 blaze WRX- sold:(
2011 Wrx limited
99 Fozz- sold
Eagle eye crew