Nice work there @JETURBO I been on the same wavelength that a bigger AR exhaust would offer less restriction and keep the boost curve flatter. I've been searching for some results similar to this as I've been thinking of going a 6boost manifold and changing my factory F6 GT3582 to a T4 housing as I'm at the point where I need to either port my wastegate or go external. Personally I don't like the idea of the weld on turbine pipe solution approach. Plus latter I have the option to go bigger down the track. Thoughts ??