Another big turbo stock block Mazdaspeed 3? Yep. Marshall’s 07 Speed 3 making 429 hp / 360 ft lbs tuned on 93 octane ONLY with a Precision Turbo & Engine 5858, 16w Fabworks intake manifold, Custom Performance Engineering exhaust manifold, Hi-Tuned Performance Products 3.5” intake; and Speed Perf6rmanc3 port injection kit (500hp kit). Efficient setup that allowed us to get over 400 hp with 93 alone while keeping the torque low.
