I was asked to "de-cat" one car, and discovered that the cat had indeed been gutted in the past. I went ahead and fitted a stainless bypass and the owner immediately reported improved fuel economy. As someone who did lots of motorway miles, I doubt this was just a placebo effect :-) Martin Tom Neiland wrote: >I have heard that sometimes CATs meet with "unforunate accidents" whereby one accientially slips with a metal rod about 50 or 60 times and the inside of the CAT crubles and falls out. This, I'm told has the same effect of a bypass pipe, but may just add the slightest of echos during hard acceleration. This is all second hand information ;) > > > ------------------------------------ To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnewsYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/