i have finally got it , part of my exhaust did fall off. the bracket on the silencer to be precise. i found out this as today my exhaust fell off!!! i had just took my bis off the clock 85mph+. as i came on to the slip road near my home the tone of my engine changed to say the least.the two downpipes remain and my car now sounds like a custom chopper like you see on the telly , i would like to take it back out to see if i can get more speed out of it like this , but my wife wont let me .......i can now use the two remaining downpipes to fabricate a custom box , he he he . i will have to have another car with me next time i thrash my car as i cannot guage my speed anymore!, having fun breaking things .mick , bis13.