What type of piping works best for this, and where should I go to get it. (I live in Canada) Also, has anyone done a dual-exit exhaust? I know this would be purely for aesthetics, but I was wondering what you would do for the second exhaust tip placement.
You can get straight pipe from most muffler or steel tubing suppliers. As for the dual-tip exhaust, do you mean dual pipes (a la muscle car) or just a single exit, but with a dual tip. If the second variety is your preference, then you can get a muffler with dual tips already attached.