I just changed the exhaust on my golf 1.6td. Changed everything exept the downpipe (yeah, I am lazy

).
With no muffler/silenecer.
I used a 2" pipe's with one 30degree bend.
Its not loud on freeways, but when you floor it you get a louder/sweeter sound.
Could take some pictures of you like.
I belive 2.5" is just loud...
//Klang