I repeat what I've wrote before. I drive Big Bore 77 with the Malossi exaust for big bore. As soon as I can I'll update the foto gallery. I used the Tecnigas with the Malossi MHR 6t cylinder that I had before.
Why does everyone whine about the exhaust. It says MHR BigBore Exhaust in the partlist. This must be one of the best exhaust you can get to the MHR Bigbore 77
Pretty sure the C21 and C30 will be "too little" for this 50mm cylinder. Maybe a Roost 77 or 87 exhaust would be just as good as the MHR...
The Tenigas though is pretty poor for this kind of setup i think.