OK, so my 66' is running an '85 302 with Windsor Junior heads and plated Tri-Y headers going into the stock GT exhaust system with resonators thru valance. I'm looking to upgrade the exhaust from the collectors back. So, firstly, are we talking an H- or X-pipe in a 2 1/2" system? What mufflers do folks suggest? Has anyone installed these Pype systems? Flowmaster versus Magnaflow. Not interested in a highway drone. Car has a 5-speed, so revs at 75mph cruising speed are 2300-ish with 3.25 gears. All suggestions welcome, but I want to know the H- versus X- answer.
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