I run an Aussie downpipe with no boost control and I get a maximum of about 11psi. This is with full custom 3" system and hi-flow cat.
Don't see why an ebay downpipe would be a problem. As suggested, just make sure it is a good design and will not foul the wastegate flap which can be an issue with some DPs
Aussie is mild steel, but stainless should not be a problem.
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