Can't help with the Epcos, but TOR's are Triumph optional pipes. TOR stands for Triumph Off Road, called that because. I believe, they are not street legal in the UK.
A less expensive option for priprs is to buy debaffled stock pipes from Don Shigakewa (
dshigeka@sbcglobal.net ). He goes by chevy605 on the BonnevilleAmerica.com forum. You can email him to see what he has available. He buys stock pipes and mods them. He'll either sell you a set or you can ship your stock ones to him and he'll mod them and send them back.
I bought from him, spent about $140 with shipping. I thought I'd just use them till I could afford something else, but after installing them and hearing them, I won't be looking to replace them. They make my America sound like the Bonnie I had, way back when.
Hope this is of some help