Here's another 1275 Sportster but this one has a notoriously poor exhaust - the Roland Sands Design Tracker. Hammer performance who supply the 1275 kits suggest chopping the baffle in half so I gave it a go. The numbers are 88.46 TQ and 83.11 HP - not too bad!
Re: 1275 Sportster, Andrews cams, head work, modified baffle ...
Hi there Cha. My best results came from either the V & H Upsweep 2 into 1 and also the Cobra El Diablo was good. There's a full comparison of exhausts here that makes some interesting reading ... http://www.hammerperf.com/ttxlexhaust.shtml