ive got a performance backbox on my k11 but i still think its a bit quiet, just wonderedif there is any way of making it louder but not illegal and obviously pass an mot!
they,re all basicly the same bore benji (tho some brands are slightly different) some have a different size cherry bomb in the midpipe, and some dont have one at all , you could fit a coilpack k11 midpipe if you want to remove the 2nd cat and make it louder (longer midpipe, as in the pic) http://www.micra.org.uk/attachment.php?attachmentid=13302&stc=1&d=1248712637