It all depends on what you want to do, the elbow is restrictive, but the downpipe is REALLY bad becuase the pre-cat in it usually clogs. You can go with a new downpipe and elbow, or a elbow/downpipe that is one piece, or even better IMHO is a divorced downpipe which vents the wastegate to atmosphere instead of into the exhaust system. A lot of cars do that anyways, sounds better, and allows the exhaust to flow the exhaust only, and not the exhaust and excess boost from the turbo, which can kill the flow.
Such is the disadvantage of an integrated wastegate...
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