A mongoose system isn't that much louder than any of the others lol, and its hardly going to attract much attention from the cops. Cossys only really make a big noise at full chat, and you arent going to be doing that with officers around are you... lol

Its only shit heaps like novas and civics that attract attention from the cops, because they make the most loudest and hidious noises even when they are at 2k lmao. (usually becuase of the fact the little chav driving it has put some stupid oversized can on the back)

Unless your running a side exit exhaust or anti lag I can't ever see a cossy attracting too much attention in the exhaust department