You are probably still running with the rubber breather hose from the crankcase (at the rear lower right when looking from the front). This is a known weak spot and Audi now sell (or at least did 2 years ago when I got mine) a modified section made from steel to stop this pipe from collapsing in...
These are not the cheapest of engines to tune. The biggest gains are to be had by fitting a ported big valve head and shrick cam (175bhp), but this will cost you over £1000. Would be cheaper to do as I did and fit the 20V 7A or go the whole way and fit a 20V turbo (if you can find one).
You...
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