ive noticed my vectra i just bought (wish i didnt now!) the turbo is hissing loud when i rev like a dump valve sort of, and when i come off the accelerator i feel quite a clunk, thinking it may be a hole in the intercooler pipe causing loss of pressure... and one of the big pipes coming off my engine is actually taped up with electrician tape!!! but looks pretty air tight... hmm any ideas people
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