Oh, In that case you'll have to wait until someone with tips can tell you factual information but I can give you these;
fact 1: Tips are Tips mate - you can buy universal tips and just chop the tips of your current exhaust and either weld or mount the new tips on
fact 2: They don't add anything but looks.
fact 3: if you want just looks go for tips
fact 4: if you want noise and actual measurable horse power gains then buy a exhaust system or at least the muffler