Not that it matters now you have your waste gate/dump valve to control back pressure but I wonder if the big tube design of the its header would help in that area at all...Just picked up car with the new ETS header installed! The car does seem to build boost easier. the biggest change is the collector/secondary size:
We had to use a 2.0 to 2.5” from KillerB collector to IAG rotated uppipe. For the ETS it is a direct 2.5” Vband connection. We’ll see if this difference will show up on the dyno
Dyno tuned scheduled for next week!