The muffler is actually 2" input, but 2-1/4" output. Downpipe is now connected to the midpipe. 255lph fuel pump is installed. Idle is stable once warmed up now that I fixed the exhaust leak from the PCV. Now I need a 2" OD to 2.5" ID (2.4" OD actual) coupler to connect the mid-pipe to the stock-ish muffler temporarily until I can get around to making a 2.5" mid-pipe-back exhaust.