Measuring boost back pressure

Check out the S480 clones on eBay too. I’ve been eyeing this one as an upgrade if I ever finish my current build. S400SX4 S480 80mm Billet Wheel T4 Twin Scroll 1.25 A/R Turbo 96/88mm Turbine | eBay
I’ve thought about going that route also but I’d have to rebuild my hot side to get a s475/s480 to fit. What I’m really itching to do is two smaller turbos tucked up inside the fender wells behind the headlights. :)