Has anyone measured the back pressure in their exhaust (after the turbine) to see what the pressure was with the stock exhaust and afterwards with a 3" TBE? Knowing the power before and after would be a bonus.

Just looking for some objective data.

 

The stock turbo doesn't even come close to filling up a 3" exhaust so back pressure should depend on turbo restrictions.

The stock downpipe is very restrictive even without a cat attached.

Most people don't start recording back pressure until they have monster turbos and I highly doubt they would try running the stock exhaust for that.