Don, I went the line of a 6-3-1 system. Took some time to get to fit
right and even now the front and rear clamp bolts are missing (I can't
fit them because of the radius of No. 1 and 6 pipes). These were the
first set made by the Penrith Muffler Man in NSW (Contact is Andrew)
and they cost me $180 (aus). I'm sure they've refined them somewhat
by now. I run a single 2-1/4in outlet pipe with a straight through
sports muffler. This has resulted in a very noisy system but the HP
increase has been noticeable! Spins to 6500 rpm without too much
trouble! Let me know if you need more details.
John Mc
'71 TR6 PI
'Fast is First'
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