With a turbo, minimal back pressure is good. Need a bit or it'll eat the oil seals on the turbo.

N/A will need more back pressure or you'll lose power.

My silencer is very small, and is part of the tailpipe. And is you say now, that noise doesn't matter, you won't later

Mine is now very much off the road due to a small ban But when I get back on the road I'm buying a very quiet honda or something, cos a loud ford just ain't cutting it