I had standard port and actuator with my first tune, Exhaust was twin 2.5 catback and a 100cell cat welded to stock dump, ran 12psi very well no spiking. Trav was running 400kw with ported stock housing, stock flapper and stock actuator. Held boost fine with a Manta exhaust system (massive dump, twin cats and twin 3inch) Tuner said he has on limit of stock actuator controlling boost so we threw a bigger one on last night, what a fiddly job. My turbo setup is exactly the same now as his old setup, stock 3582r with ported housing, stock flapper and stock actuator. Running Xforce 4inch dump, 100cell cat and 3.5 system. Tuner is confident and said he does multiple cars this way without drama.