2010 Nissan Frontier 4.0L V6.
A rattling on heavier throttle started a few months back - I finally figured out it was a leak in the crossover pipe behind the cats. It's all original so I'm going to replace everything behind the cats instead of trying to patch stuff in. I'm in Victoria, BC but it was about $200 cheaper for me to order from Rockauto and have it shipped to Point Roberts, WA, so I could pick it up when I was in Vancouver for work. No taxes at the border but still would have been quite a bit cheaper than buying locally. I'll be replacing a couple of pipes. muffler, along with various gaskets and clamps. Also trying to put the original heat shields back on the new stuff......