Hey guys, I'm about to do a stainless exhaust for my 78 b210. From what I have read on the forums I have decided to go with a 2in all the way back, and will likely be using an hks hi power muffler. My question is, I am still running the stock exhaust manifold, so can I simply run 2in. from the exhaist manifold or should I taper the exhaust from the stock size to a 2 in pipe? Will I run into exhaust flow issues if I go with 2in directly from the manifold? Any advice is greatly appreciated guys! Thanks!