Good to see the photos, thanks!
The joys of car ownership...
There's lots of data out there, but none for your particular car. What always interests me is not absolute values (those are often so easily gamed) but rather delta values. And those are never relevant unless they're done on the same car, but the same operator, in conditions as close as possible to each other (with variations noted).
Turbo lag is generally due to the size of the turbo and how much exhaust gas flow it takes to spool it up. I've seen lots of comments about longer intake paths and larger intercooler volumes meaning that boost takes longer to build because there's more volume, but honestly, at the pressures and airflow rates we're talking, the difference is absolutely minimal.
You should see better performance though, as there should, all other things being equal, be less flow resistance through the core and pipework, and so less pressure drop between the turbo and the intake manifold. More pressure equals more air equals the ability to burn more fuel equals more power.
As before, thanks for photos. If you include the "rubber flap" (designed to help keep airflow going through the core and the radiator), what's the thickness of the OEM setup? Looks pretty similar to the Wanger - meaning that the Wanger's about as big as you can get before having to compromise fitting. Nice.
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