Hi Chris - I used an ordinary elcheapo muffler. I think it cost like $40 and the 2" pipe was about the same. I've mounted mine forward of the diff (under where the back seat was). My last
A12 with twin 40's and big extractors sounded grunty with this system - but not so loud that the constabulary came looking! The induction noise wasn't drowned out either :)
Hedman Hedders make a nice muffler out of the States - $60. Most of us who buy original 1200's find that they still have most of the 28 year old pea shooter exhaust system left - mild steel
lasts OK and frees up money for go fast things!!
I'm dropping my A15 head into the machine shop tomorrow. I'm running avgas so will aim for about 11.5:1 compression. I cc'd the head today - was 30ml - and we need to plane that down to
17ml. I can let you know how things go with gaskets, pushrods etc if you're interested. Are you going to modify it or just bolt on? Is it a round or oval port head? Let me know if I can
help.