Not really if anything it will flow better as right now it has the t3 flange on it. Gotta drop it down to the wider part of the collector to even fit the t4 divided flange on there. Gonna reposition the wastegate tube/flange if i can to a 45 deg angle in the same direction as the collector to help with wastegate flow. Should work out well as far as turbo placment, flow, and so on. Gonna thin out the divider of the t4 flange on the collector side to help improve flow into the divided housing.