There are many causes of boost leaks in the S2, especially if it's on all of its original rubber intake hoses. As mentioned above, get it diagnosed by a forum member with VAGCOM and a pressure testing kit, then you can make a start in tracking down and replacing the exact problem.
Re chipping - get the boost leaks fixed first, you'll be losing a huge amount of performance from those, and chipping it will still only force the air out through those leaks! Once your plumbing is plugged, a chip will get you a 60bhp gain up to the 270-280bhp mark, with a 60nm increase in torque. A huge gain in performance for not much money. But first, fix the leaks!
Re chipping - get the boost leaks fixed first, you'll be losing a huge amount of performance from those, and chipping it will still only force the air out through those leaks! Once your plumbing is plugged, a chip will get you a 60bhp gain up to the 270-280bhp mark, with a 60nm increase in torque. A huge gain in performance for not much money. But first, fix the leaks!
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