FULL BOOSTED RESULTS. TURBO 440 MOPAR. DIY TURBO KIT. Boost is what every lowcompression, Motorhome 440 needs. We ran this test on pump to illustrate how well the 440 responded to boost from our single turbo. Using stock (cast) exhaust manifolds, I fabricated a kit that included a Ypipe with dual Turbo Smart wate gates and a single VS Racing 7875 Gen 2 turbo. Big Torque!