I've got a complete period "Supertrapp" system on my F2 (yeah Sean, they did 'em for SOHC's as well) it's actually for an F1 so I had to ditch the factory heat sink cooler crap thing, it's ok, but has previously been mentioned, the header design is poor, IMHO.
Well I'll be damned. I've never seen one over here, new or used, for the SOHC. Leave it to you Aussies though, if it's available and can increase performance you'll find it 
G'Day Sean, well it actually came from the USA, in fact, California. I bought it on Evil Bay from a guy who I'd bought a tank from previously, but after 4 months it hadn't arrived, he was still selling stuff but wouldn't return my emails or Ebay PM's. After trying to do the right thing for another few weeks I took a different tack, I bid $1000.00 on every one of his auctions, and not surprisingly, won them all, about 30 in total. The dumb #$%* sent me a "Congratulations!" message, with an invoice for several hundred bucks, (most of his parts that I won were just junk) so I sent him back a message saying "Where is my Supertrapp pipe?"
He replied that there'd been a problem with his "shipping department", (what a dick, like Tom he was a one-man operation) "but seeing as how I'd been such a good customer" he'd airmail the exhaust right away! I said no worries, but I wasn't paying for all that other stuff until the pipe arrived, so suddenly it arrived on my doorstep, and the shipping cost (that he paid) was more than I paid for the pipe and surface mail! He then emailed me about payment for all the other stuff, so I told him to go f*ck himself. I don't know if it's added any performance though, I've only ridden the bloody thing about 50 miles in the 2 years since I restored it, I've gotta pull the engine down and reseal the crankcase halves because I used the wrong grade Loctite sealant, (or not enough) and I just don't want to, ha ha! Cheers, Terry.
