I installed a '73 FI exh. manifold on my '71 144S. I replaced the 4-1 manifold that IPD used to sell as the headers kept smacking the rear of the A-arm...the headers only fit some of the 140's, and I don't own any ones it fits (I have 2 '71 145 & 1 '71 144. These may fit the 142s. I am running a weber 32/36 setup so the installation was easy as the weber manifold mates right up to the FI manifold. Run the dual pipes to the collector using the stock size from manifold, then run 2" straight back w/ 24" long thrush glasspack 2" ID & OD, to 240 resonator 3/4 of the way back and straight pipe out. Sounds good.
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