HELP,
I have just fitted a full de cat system ona my99 turbo (uk), when i rev it up there is a big cloud of blue smoke. Does anyone else get this from a de cat??? It doesnt seem to do it all the time, but its embarasing, it looks like all the rst around my area!!!
Thanks Justin

 

Its my guess that your turbo seals have gone and now you have no cats, the smoke is coming straight out of the exhaust, rather than being burnt up by the cats.

 

Almost certainly a turbo problem.
I would get it checked out before it goes pop big time, otherwise it might spit bits of rotor into the engine, which I guess would be a bad thing.