Hello I found a hole in turbo regulator pipe have put new 1 on today and turbo still not boosting sounds like a hissing noise but when I rev it stationary it sounds normal hardly got no power can anybody help me I'm stuck please 

If you can hear hissing, there is probably still a leak somewhere.

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Remove the intercooler and check the pipework there too, if it's the stock plastic pipework it's pretty poor

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